5Giovannucci E, Tosteson TD, Speizer FE, et al. A long-term study of mortality in men who have undergone vasectomy [J]. N Engl J Med, 1992,326(21): 1392~1398.
6Rosenberg L, Palmer JR, Zauber AG, et al. The relation of vasectomy to the risk of cancer[J]. Am J Epidemol, 1994,140(5):431~438.
7Adamopoulos DA, Lawrence DM, Swyer GI. Determination of testosterone concentration in semen of men with normal or subnormal sperm counts and after vasectomy[J]. Acta Eur Fertil, 1976,7(3):219~225.
9Carrie J,William J.Androgens in men-uses and abuses[J].Drug Therapy,1996,334(11):707 ~714.
10Lo C K,Pan C P,Liu W H.Production of testosterone from phytosterol using a single -step microbial transformation by a mutant of Mycobacterium sp.[J].Journal of Industrial Microbiology & Biotechnology,2002,28:280 ~ 283.