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Journal of Biosocial Science|January 1, 1990
Attitudes towards contraceptive implants and injectables among present and former users in SingaporeK Singh, O A Viegas, S S RatnamSingapore Medical Journal|July 1, 1997
A series of ovarian clear cell and endometrioid carcinoma and their association with endometriosisS Chew, K F Tham, S S RatnamEuropean Journal of Obstetrics, Gynecology, and Reproductive Biology|May 1, 1993
Tramadol in labour pain in primiparous patients. A prospective comparative clinical trialO A Viegas, B Khaw, S S RatnamAmerican Journal of Public Health|February 1, 1978
Effects of social disincentive policies on fertility behavior in SingaporeS B Tan, J Lee, S S RatnamArchives of Andrology|January 1, 1990
Lack of correlation of selenium level in human semen with sperm count/motilityA C Roy, R Karunanithy, S S RatnamGynecologic and Obstetric Investigation|January 1, 1989
Amniotic fluid selenium status in pre-eclampsiaA C Roy, S S Ratnam, R KarunanithyAdvances in Contraception : the Official Journal of the Society for the Advancement of Contraception|March 1, 1990
A three-year evaluation of hemostatic function in Singaporean Norplant acceptorsK Singh, O A Viegas, S S RatnamSingapore Medical Journal|December 1, 1990
Norplant contraceptive implants--a comparison of capsules versus rods in SingaporeK Singh, O A Viegas, S S RatnamBritish Journal of Obstetrics and Gynaecology|November 1, 1976
Plasma levels of oestriol-17 beta, oestriol and human placental lactogen during bed restP C Chew, H Mok, S S RatnamPageof 42