Maintenance work on the ZORA databases is scheduled for Wednesday 22 May 2019 from 20:00-22:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Nyante, S J; Graubard, B I; Li, Y; McQuillan, G M; Platz, E A; Rohrmann, S; Bradwin, G; McGlynn, K A (2012). Trends in sex hormone concentrations in US males: 1988-1991 to 1999-2004. International Journal of Andrology, 35(3):456-466.