1. UFRGS-FAMED; Ginecologia e Obstetricia; Ramiro Barcelos 2350/1124 Porto Alegre RS Brazil 90035-903
2. University of Liverpool; Liverpool Reviews and Implementation Group; Whelan Building The Quadrangle, Brownlow Hill Liverpool UK L69 3GB
3. Radboud University Nijmegen; Faculty of Medical School; Geert Grooteplein 9 PO Box 9101 Nijmegen Netherlands 6500HB
4. The Whittall Street Clinic; Department of G U Medicine; Whittall Street Birmingham UK B4 6DH