1. Department of Statistics; North Carolina State University; 2311 Stinson Drive Raleigh NC 27695 U.S.A.
2. Department of Biostatistics; Harvard School of Public Health; Boston MA U.S.A.
3. Computational Informatics; Commonwealth Scientific and Industrial Research Organisation; Australia
4. School of Mathematical Sciences; University of Technology; Sydney
5. Department of Epidemiology; Harvard School of Public Health; Boston MA U.S.A.
6. Department of Obstetrics, Gynecology, and Reproductive Biology; Brigham and Women's Hospital and Harvard Medical School; Boston MA U.S.A.
7. Channing Laboratory, Department of Medicine; Brigham and Women's Hospital and Harvard Medical School; Boston MA U.S.A.
8. Department of Environmental Health; Harvard School of Public Health; Boston MA U.S.A.
9. Vincent Memorial Obstetrics and Gynecology Service,Andrology Laboratory and In Vitro Fertilization Unit; Massachusetts General Hospital; Boston MA U.S.A.