Original Study Clinical Characteristics and Stage at Presentation of Glaucoma Patients in Sub-Saharan Africa Olawoye, Olusola; Kizor-Akaraiwe, Nkiru; Pons, Jonathan; More Olawoye, Olusola; Kizor-Akaraiwe, Nkiru; Pons, Jonathan; Sarimiye, Tarela; Washaya, Jennifer; Hughes, Sowunmi; Ashaye, Adeyinka; Garba, Farouk; Gessesse, Girum W.; Chitedze, Richard; Ibanga, Affiong; Saka, Vincent; Agre, Jeremie; Mahdi, Abdull; Ogunro, Adunola; Budengeri, Patrick; Ajibode, Haroun Adetunji; Tamrat, Lemlem; Onakoya, Adeola; Okeke, Suhanya; Hulley, Jo-Anne; Giorgis, Abeba; Onyekachi, Ireka Williams; Okosa, Chimdi Chuka; Ogbonnaya, Chimdia; Abdulsalam, Shuaib; Fowobaje, Kayode; Cook, Stephen; Lawrence, Scott; Macheka, Boniface; Chan, Ving Fai; Blanco, Augusto Azuara; Congdon, Nathan; Realini, Tony; the STAGE Research Group (see Appendix) Less June 27, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Editorial Journal of Glaucoma, 30th Anniversary Van Buskirk, Michael Van Buskirk, Michael Less June 27, 2022 Favorites PDF Get Content & Permissions Buy PAP
Original Study Peripapillary and Macular Vascular Density in Patients with Preperimetric and Early Primary Open-Angle Glaucoma Oba, Turker; Solmaz, Nilgun; Onder, Feyza Oba, Turker; Solmaz, Nilgun; Onder, Feyza Less June 21, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Repeatability and Reproducibility of 4.5 by 4.5 mm Peripapillary Optical Coherence Tomography Angiography Scans in Glaucoma and Nonglaucoma Eyes Shen, Alena J.; Urrea, Anna L.; Lee, Jae Chang; More Shen, Alena J.; Urrea, Anna L.; Lee, Jae Chang; Burkemper, Bruce; LeTran, Vivian H.; Zhou, Xiao; Chu, Zhongdi; Grisafe, Dominic J.; Fard, Ali; Wong, Brandon; Song, Brian; Xu, Benjamin Y.; Wang, Ruikang K.; Richter, Grace M. Less June 16, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Original Study Energy Dose-Response in Selective Laser Trabeculoplasty: A Review Radcliffe, Nathan; Gazzard, Gus; Samuelson, Thomas; More Radcliffe, Nathan; Gazzard, Gus; Samuelson, Thomas; Khaw, Peng; Sun, Xinghuai; Aung, Tin; Lam, Denis; Singh, Kuldev; Katz, L. Jay; Aronov, Michael; Sacks, Zachary; Solberg, Yoram; Lindstrom, Richard; Belkin, Michael Less June 15, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Go to Full Text of this Article Open PAP
Original Study Comparison of Vascular Density and Structural Patterns Between POAG and PACG Mohammadi, Massood; Mohammadi, S. Saeed; Tabatabaei, Seyed Mehdi; More Mohammadi, Massood; Mohammadi, S. Saeed; Tabatabaei, Seyed Mehdi; Eslami, Yadollah; Zarei, Reza; Zandvakil, Narges; Fakhraie, Ghasem; Safizadeh, Mona; Farshchi, MohammadReza; Moghimi, Sasan Less June 14, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Short-term Efficacy and Safety of Open Conjunctiva ab Externo XEN45 Gel Stent Implantation in Glaucoma Patients Thatcher, Mitchell D.; Coupal, Dustin J.; Cheng, Yanzhao; More Thatcher, Mitchell D.; Coupal, Dustin J.; Cheng, Yanzhao; Podbielski, Dominik W. Less June 14, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Effect of Optic Disc Tilt on the Measurement of Peripapillary Vessel Density Using Optical Coherence Tomography Angiography Han, Ye Eun; Sung, Kyung Rim Han, Ye Eun; Sung, Kyung Rim Less June 14, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Structural and Metabolic Imaging after Short-term Use of the Balance Goggles System in Glaucoma Patients: A Pilot Study Sun, Michelle T.; Beykin, Gala; Lee, Wen-shin; More Sun, Michelle T.; Beykin, Gala; Lee, Wen-shin; Sun, Yang; Chang, Robert; Nunez, Mariana; Li, Katherine Zhongqiu; Knasel, Cara; Rich, Collin; Goldberg, Jeffrey L. Less June 13, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Outcomes of Prolene Gonioscopy-assisted Transluminal Trabeculotomy in Primary Open-angle Glaucoma and Pseudoexfoliative Glaucoma: A Comparative Study Aktas, Zeynep; Ozdemir Zeydanli, Ece; Uysal, Betul Seher; More Aktas, Zeynep; Ozdemir Zeydanli, Ece; Uysal, Betul Seher; Yigiter, Ahmet Less June 13, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Efficacy of Combined Phacoemulsification and Goniosynechialysis in Primary Angle-closure Disease with Different Degrees of Peripheral Anterior Synechiae Wei, Liqing; Fu, Lin; Nie, Li; More Wei, Liqing; Fu, Lin; Nie, Li; Lian, Hengli; Qian, Zhenbin; Liang, Yuanbo; Pan, Weihua Less June 10, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Case Report/Brief Report Gonioscopy-assisted Transluminal Trabeculotomy Following Failed iStent Surgery Sigona, Mark; Saravanan, Amrita; Pipis, Spyros; More Sigona, Mark; Saravanan, Amrita; Pipis, Spyros; Masood, Imran Less June 03, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study An Objective and Easy-to-Use Glaucoma Functional Severity Staging System Based on Artificial Intelligence Huang, Xiaoqin; Saki, Fatemeh; Wang, Mengyu; More Huang, Xiaoqin; Saki, Fatemeh; Wang, Mengyu; Elze, Tobias; Boland, Michael V.; Pasquale, Louis R.; Johnson, Chris A.; Yousefi, Siamak Less June 03, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Case Report/Brief Report Novel Surgical Techniques to Control Flow with PreserFlo® MicroShunt for Late Hypotony After Baerveldt Drainage Device Implantation Fritsche, Raphael; Müller, Luzia; Bochmann, Frank Fritsche, Raphael; Müller, Luzia; Bochmann, Frank Less June 03, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Association of Polymorphisms at the SIX1/SIX6 Locus with Normal Tension Glaucoma in a Population from the Republic of Korea Shin, Hye-Young; Lee, Young Chun; Lee, Mee Yon Shin, Hye-Young; Lee, Young Chun; Lee, Mee Yon Less June 03, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Comparison of Outcomes from Delayed Onset Bleb-related Endophthalmitis Treated with Pars Plana Vitrectomy versus Vitreous Biopsy Islam, Yasmin Florence Khodeja; Vanner, Elizabeth A.; Khurshid, Syed Gibran; More Islam, Yasmin Florence Khodeja; Vanner, Elizabeth A.; Khurshid, Syed Gibran; Flynn, Harry W. Jr; Greenfield, David S. Less June 02, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study The Association between Regional Macula Vessel Density and Central Visual Field Damage in Advanced Glaucoma Eyes Ghahari, Elham; Bowd, Christopher; Zangwill, Linda M.; More Ghahari, Elham; Bowd, Christopher; Zangwill, Linda M.; Proudfoot, James A.; Penteado, Rafaella C.; Kyung, Haksu; Hou, Huiyuan; Moghimi, Sasan; Weinreb, Robert N. Less June 02, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Original Study Long-term Outcomes of Modified 360-degree Suture Trabeculotomy for Uveitic Glaucoma Compared with Primary Open Angle Glaucoma Kijima, Riki; Shinmei, Yasuhiro; Chin, Shinki; More Kijima, Riki; Shinmei, Yasuhiro; Chin, Shinki; Kanaya, Rina; Shinkai, Akihiro; Ohguchi, Takeshi; Namba, Kenichi; Ishida, Susumu Less June 02, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Efficacy and Safety of the Preserflo Microshunt ® with Mytomicin C for the Treatment of Open Angle Glaucoma Ibarz Barberá, Marta; Martínez Galdón, Fátima; Caballero Magro, Elena; More Ibarz Barberá, Marta; Martínez Galdón, Fátima; Caballero Magro, Elena; Rodríguez-Piñero, Marta; Tañá Rivero, Pedro Less May 17, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Go to Full Text of this Article Open PAP
Original Study Comparison of the Structure-function Relationship Between Advanced Primary Open-angle Glaucoma and Normal-tension Glaucoma Sung, Mi Sun; Ji, Yong Sok; Heo, Hwan; More Sung, Mi Sun; Ji, Yong Sok; Heo, Hwan; Park, Sang Woo Less May 16, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Efficacy and Safety of Micropulse Transscleral Laser Therapy in Silicone Oil-induced Glaucoma Zbiba, Walid; Sayadi, Sana; Kharrat, Malek; More Zbiba, Walid; Sayadi, Sana; Kharrat, Malek; Daoued, Maroua Less May 10, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Intraocular Peak Pressure in Patients under Treatment with Fixed Combination of Bimatoprost/ Timolol/ Brimonidine once Daily versus Twice Daily Susanna, Bianca Nicolela; Susanna, Carolina Nicolela; Susanna, Fernanda Nicolela; More Susanna, Bianca Nicolela; Susanna, Carolina Nicolela; Susanna, Fernanda Nicolela; Mota, Rodrigo Toledo; Barbosa, Gabriel Castilho Sandoval; Lima, Vagner Loduca; Susanna, Remo Jr Less May 06, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Association between Serum Vitamin D Level and Rates of Structural and Functional Glaucomatous Progression Lee, Terry; Jammal, Alessandro A.; Medeiros, Felipe A. Lee, Terry; Jammal, Alessandro A.; Medeiros, Felipe A. Less May 06, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Case Report/Brief Report Iris Obstruction Following PRESERFLO™ Microshunt Implantation and Surgical Management Trigaux, Céline; Steindor, Friedrich A.; Spaniol, Kristina; More Trigaux, Céline; Steindor, Friedrich A.; Spaniol, Kristina; Geerling, Gerd; Borrelli, Maria Less May 06, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Case Report/Brief Report Indocyanine Green Aided Schlemm’s Canal Identification During Gonioscopic Assisted Transluminal Trabeculotomy Panigrahi, Arnav; Huang, Alex S.; Arora, Monika; More Panigrahi, Arnav; Huang, Alex S.; Arora, Monika; Kumari, Somya; Mahalingam, Karthikeyan; Gupta, Viney; Gupta, Shikha Less May 06, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Remote Video Monitoring of Simultaneous Visual Field Testing Meshkin, Ryan S.; Zhao, Yan; Elze, Tobias; More Meshkin, Ryan S.; Zhao, Yan; Elze, Tobias; Boland, Michael V.; Friedman, David S. Less April 28, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Associated Factors and Distribution of Peripapillary Retinal Nerve Fiber Layer Thickness in Children by Optical Coherence Tomography: A Population-based Study Hashemi, Hassan; Khabazkhoob, Mehdi; Heydarian, Samira; More Hashemi, Hassan; Khabazkhoob, Mehdi; Heydarian, Samira; Emamian, Mohammad Hassan; Fotouhi, Akbar Less April 27, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Diagnostic Performance of Optical Coherence Tomography for Pseudoexfoliation Glaucoma Ozcelik-Kose, Alev; Yıldız, Merve Beyza; Imamoglu, Serhat Ozcelik-Kose, Alev; Yıldız, Merve Beyza; Imamoglu, Serhat Less April 27, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Association between Dietary Salt Intake and Open Angle Glaucoma in the Thessaloniki Eye Study Tseng, Victoria L.; Topouzis, Fotis; Yu, Fei; More Tseng, Victoria L.; Topouzis, Fotis; Yu, Fei; Keskini, Christina; Pappas, Theofanis; Founti, Panayiota; Anastasopoulos, Eleftherios; Harris, Alon; Wilson, M. Roy; Coleman, Anne L. Less April 27, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Case Report/Brief Report External Jugular Vein Compression Aided Gonioscopic Assisted Transluminal Trabeculotomy in Eyes with Congenital Glaucoma Gupta, Shikha; Panigrahi, Arnav; Mahalingam, Karthikeyan; More Gupta, Shikha; Panigrahi, Arnav; Mahalingam, Karthikeyan; Kumari, Somya; Gupta, Viney Less April 25, 2022 Favorites PDF Get Content & Permissions Buy SDC PAP
Original Study Effect of Mydriatic Administration On Retinal Hemodynamics in Glaucoma: An Optical Coherence Tomography Angiography Study Ozturker, Zeynep; Kurt, Rengin Aslihan Ozturker, Zeynep; Kurt, Rengin Aslihan Less April 14, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Case Report/Brief Report Laser-Induced Damage to Disposable Gonioscopy Lenses during Selective Laser Trabeculoplasty Oydanich, Marko; Kass, William; Khouri, Albert S. Oydanich, Marko; Kass, William; Khouri, Albert S. Less April 14, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Intracanalicular Dexamethasone Insert or Topical Prednisolone following iStent and Hydrus Surgery for Glaucoma Jackson, Kevin J.; Akrobetu, Dennis; Guduru, Abhilash; More Jackson, Kevin J.; Akrobetu, Dennis; Guduru, Abhilash; Herndon, Leon W. Less April 14, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Femtosecond Laser-Assisted Cataract Surgery in Patients with Prior Glaucoma Surgery Salimi, Ali; Qi, Susan Ruyu; Harasymowycz, Paul Salimi, Ali; Qi, Susan Ruyu; Harasymowycz, Paul Less April 07, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Original Study Hemoglobin Video Imaging Detects Differences in Aqueous Outflow between Eyes With and Without Glaucoma During the Water Drinking Test Lusthaus, Jed A.; Meyer, Paul A.R.; McCluskey, Peter J.; More Lusthaus, Jed A.; Meyer, Paul A.R.; McCluskey, Peter J.; Martin, Keith R. Less April 06, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy SDC PAP
Original Study Outcomes and Revenue Generation of a Community-based Screening at a Center in the United States: The SToP Glaucoma Program Varadara, Varshini; Wahl, Madison; Gajwani, Prateek; More Varadara, Varshini; Wahl, Madison; Gajwani, Prateek; David, Jenina; Dutson, Madison; Zhao, Di; Guallar, Eliseo; Swenor, Bonnielin K.; Johnson, Thomas V.; Friedman, David S.; on behalf of The SToP Glaucoma Study Group Less April 06, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Association of Epiretinal Membrane with Pseudoexfoliation Glaucoma and Long-term Factors Affecting Visual Function Lee, Jin Yeong; Sung, Kyung Rim; Kim, Yoon Jeon Lee, Jin Yeong; Sung, Kyung Rim; Kim, Yoon Jeon Less March 29, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study Discrimination between Healthy Eyes and Those with Mild Glaucoma Damage Using Hemoglobin Measurements of the Optic Nerve Head Meneses, Livia Studart de; Ciarlini, Lorena Ribeiro; Ayub, Gabriel; More Meneses, Livia Studart de; Ciarlini, Lorena Ribeiro; Ayub, Gabriel; Vasconcellos, José Paulo C.; Costa, Vital Paulino Less March 29, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Review Article Glaucoma Treatment Outcomes in Open-Angle Glaucoma Patients of African Descent Siesky, Brent; Harris, Alon; Belamkar, Aditya; More Siesky, Brent; Harris, Alon; Belamkar, Aditya; Zukerman, Ryan; Horn, Avery; Vercellin, Alice Verticchio; Mendoza, Kristen Ann V.; Sidoti, Paul A.; Oddone, Francesco Less March 29, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study: PDF Only Distinguishing Healthy from Glaucomatous Eyes with OCT Global Circumpapillary Retinal Nerve Fiber (cpRNFL) Thickness in the Bottom 5th Percentile Zemborain, Zane Zenon; Tsamis, Emmanouil; La Bruna, Sol; More Zemborain, Zane Zenon; Tsamis, Emmanouil; La Bruna, Sol; Leshno, Ari; De Moraes, Carlos Gustavo; Ritch, Robert; Hood, Donald Charles Less March 18, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study: PDF Only Repeatability of Corneal Hysteresis Measurements in Glaucoma Patients During Routine Follow up and after Cataract Surgery Zehavi-Dorin, Tzukit; Kutzscher, Anne E.; Badr, Mai; More Zehavi-Dorin, Tzukit; Kutzscher, Anne E.; Badr, Mai; Mora, Marta; Shyu, Yennie; Porco, Travis C.; Stamper, Robert L. Less March 01, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study: PDF Only Glaucoma Cascade Screening in a High-risk Afro-Caribbean Haitian Population: A Pilot Study Chang, Ta C.; Celestin, Linda; Hodapp, Elizabeth A.; More Chang, Ta C.; Celestin, Linda; Hodapp, Elizabeth A.; Grajewski, Alana L.; Junk, Anna; Rothman, Adam L.; Duerr, Eric R.H.; Swaminathan, Swarup S.; Gedde, Steven J.; Young, Terri L.; Wiggs, Janey; Olivier, Mildred M.G.; Quintanilla, Raquel; Arrieta, Esdras; Savatovsky, Eleonore J.; Vanner, Elizabeth A.; Parrish, Richard K. Less February 08, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Go to Full Text of this Article Open PAP
Original Study: PDF Only Repeatability and Agreement of Two Swept-source Optical Coherence Tomographers for Anterior Segment Parameter Measurements Cheng, Shi-Ming; Zhang, Jia-Sheng; Li, Tian-tian; More Cheng, Shi-Ming; Zhang, Jia-Sheng; Li, Tian-tian; Wu, Ze-tong; Wang, Po; Yu, A-Yong Less January 20, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study: PDF Only Patterns of Visual Field Loss in Early, Moderate, and Severe Stages of Open-angle Glaucoma Germano, Renato Antunes Schiave; Germano, Caroline Schiave; Susanna, Fernanda Nicolela; More Germano, Renato Antunes Schiave; Germano, Caroline Schiave; Susanna, Fernanda Nicolela; Junior, Remo Susanna Less January 12, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Original Study: PDF Only Incidence of Glaucoma Progression and Rate of Visual Field Deterioration in a Cohort of Urban Ghanaians Mwanza, Jean-Claude; Tulenko, Samantha E.; Budenz, Donald L.; More Mwanza, Jean-Claude; Tulenko, Samantha E.; Budenz, Donald L.; Herndon, Leon W.; Hall, Alyson; Hay-Smith, Graham; Kim, Hanna Y.; Mathenge, Elizabeth; Spratt, Alexander; Tanna, Angelo P.; Barton, Keith Less January 12, 2022 Abstract Abstract Favorites PDF Get Content & Permissions Buy PAP
Cover Art: PDF Only Weill-Marchesani Syndrome with Secondary Angle Closure Glaucoma Thattaruthody, Faisal; Akella, Madhuri; Dhingra, Deepika; More Thattaruthody, Faisal; Akella, Madhuri; Dhingra, Deepika; Pandav, Surinder Singh; Kaushik, Sushmita Less October 29, 2019 Favorites PDF Get Content & Permissions Buy PAP
Cover Art: PDF Only Pseudoexfoliative Zonulopathy Dhingra, Deepika; Thattaruthody, Faisal; Pandav, Surinder Singh Dhingra, Deepika; Thattaruthody, Faisal; Pandav, Surinder Singh Less September 25, 2019 Favorites PDF Get Content & Permissions Buy PAP
Cover Art: PDF Only Novel Technique of Sulcus Placement of a Aurolab Aqueous Drainage Implant in a Phakic Patient Kaur, Manpreet; Pandav, Surinder Singh; Kaushik, Sushmita Kaur, Manpreet; Pandav, Surinder Singh; Kaushik, Sushmita Less August 14, 2019 Favorites PDF Get Content & Permissions Buy PAP
Cover Art: PDF Only Pars Plana Tube Insertion of Glaucoma Drainage Device Puthuran, George Varghese; Wijesinghe, Hiruni Kaushalya; Kannan, Naresh Babu Puthuran, George Varghese; Wijesinghe, Hiruni Kaushalya; Kannan, Naresh Babu Less June 03, 2019 Favorites PDF Get Content & Permissions Buy PAP
Letter to the Editor: PDF Only Reply to Comment by Gallina et al on “Progression of Normal-Tension Glaucoma After Ventriculoperitoneal Shunt to Decrease Cerebrospinal Fluid Pressure”. J Glaucoma 2016; 25: e50-e52 Chen, Brian; Drucker, Mitchell; Louis, Ken; More Chen, Brian; Drucker, Mitchell; Louis, Ken; Richards, David W. Less July 11, 2016 Favorites PDF Get Content & Permissions Buy PAP
Letter to the Editor: PDF Only A Comment on the “Progression of Normal-tension Glaucoma After Ventriculoperitoneal Shunt to Decrease Cerebrospinal Fluid Pressure”. J Glaucoma. 2016;25: e50–e52 Gallina, Pasquale; Savastano, Alfonso; Rizzo, Stanislao; More Gallina, Pasquale; Savastano, Alfonso; Rizzo, Stanislao; Di Lorenzo, Nicola; Porfirio, Berardino Less June 30, 2016 Favorites PDF Get Content & Permissions Buy PAP