Maintenance vitamin D3 dosage requirements in Chinese women with post menopausal osteoporosis living in the tropics gan Venugopal, Yogeswari, Hatta, Sharifah Sharifah Faradila Wan Muhamad, Musa, Nurbazlin, Rahman, Siti Abdul, Ratnasingam, Jeyakantha, Paramasivam, Sharmila Sunita, Lim, Lee Ling, Ibrahim, Luqman, Choong, Karen, Tan, Alexander Tong Boon, Chinna, Karuthan, Chan, Siew Pheng, Vethakkan, Shireene Ratna