1. Center for Epidemiology & Health Research Berlin, Bayer Schering Pharmaceuticals, Berlin, Germany.
2. Bayer S.A. Chile; Santiago de Chile.
3. Department of Clinical Pharmacology, Humboldt-University of Berlin, Bayer Schering Pharmaceuticals, Berlin, Germany.
4. Uniformed Services University of the Health Sciences, Bethesda, Maryland, and Women's Healthcare, Bayer HealthCare Pharmaceuticals, New Jersey.
5. Center for Epidemiology & Health Research Berlin, Berlin, Germany.