Oral androstenedione administration and serum testosterone concentrations in young men. - Leder BZ; Longcope C; Catlin DH; Ahrens B; Schoenfeld DA; Finkelstein JS; Leder, B Z; Longcope, C; Catlin, D H; Ahrens, B; Schoenfeld, D A; Finkelstein, J S (JAMA: Journal of the American Medical Association, 2000)