Journal of the Medical Association of Thailand Vol 80, No 11:NOVEMBER 1997 0125-2208 80 11 1997 Nov Bone Density in Women Receiving Norplant* Implants for Contraception 738 EN Suwachai Intaraprasert Surasak Taneepanichskul Urusa Theppisai Kamheang Chaturachinda Original Article