Renal Lesions in Pregnancy: PDF OnlySurgical Repair of the Incompetent Cervix Preliminary Report of an Anatomic Modification of the Shirodkar TechnicRITTER, HUBERT A. M.D.; RITTER, PAUL J. M.D. Author Information From the Department of Obstetrics and Gynecology, St. Louis University School of Medicine, St. Louis, Mo. Obstetrics & Gynecology 17(3):p 342-345, March 1961. Buy © 1961 The American College of Obstetricians and Gynecologists