1. Reproductive Endocrine Unit of the Department of Medicine; Massachusetts General Hospital; Boston; MA; USA
2. Endocrinology, Diabetes, & Metabolism Service; Centre Hospitalier Universitaire Vaudois; Lausanne; Switzerland
3. Department of Biostatistics; General Clinical Research Center; Massachusetts General Hospital; Boston; MA; USA
4. Department of Physiology; University of Lausanne; Lausanne; Switzerland
5. Department of Endocrinology; St. Vincent's University Hospital; Dublin; Ireland