Outcome measures: Edited by Henry Milgrom and Ralph Mösges
Vogtel, Myriam; Michels, Alexandra
Institute of Medical Statistics, Informatics and Epidemiology, University Hospital Cologne, Cologne, Germany
Correspondence to Myriam Vogtel, Institute of Medical Statistics, Informatics and Epidemiology, University of Cologne, Kerpener Street 62, 50924 Cologne, Germany Tel: +49 221 478 3456; fax: +49 221 478 3465; e-mail: [email protected]
doi: 10.1097/ACI.0b013e32833903a6