6Schiavi RC, Schreiner EP, White D, et al.The relationship between pituitary - gonodal function and sexual behavior in health aging men. Psychosem Med, 1991,53 : 363 - 374.
7Wishart JM, Need AG, Horowitz M, et al. Effect of age on bone density and bone turnover in men. Clin Endocrinol Oxf, 1995,42 : 141 - 146.
8Rupert W J, Kay - Tee K, Nicholas EDS, et al. Patterns of physical activityand ultrasound attenuation by heel boneamong [ M ]. Norfolk cohort of European Prospective Investigation of Cancer : population based study. BMJ, 2001,322 : 140 - 142.
9Cummings SR,Black DM, Nevitt MC, et al. Bone density at various sites for prediction of hip fractures[ J]. Lancet, 1993,341 (8837) : 72 - 75.
10Yan L,Zhou B, Wang X, et al. Older people in China and the United Kingdom differ in the relationships among parathyroid hormone, vitamin D, and bonemineral status. Bone, 2003,33 : 620 - 627.