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Tan, P.C. and Yow, C.M. and Omar, S.Z. (2009) Coitus and orgasm at term: effect on spontaneous labour and pregnancy outcome. Singapore Medical Journal, 50 (11). pp. 1062-7. ISSN 0037-5675, DOI 19960160.
Tan, P.C. and Yow, C.M. and Omar, S.Z. (2009) A placebo-controlled trial of oral pyridoxine in hyperemesis gravidarum. Gynecologic and Obstetric Investigation, 67 (3). pp. 151-157. ISSN 0378-7346, DOI https://doi.org/10.1159/000181182.
Tan, P.C. and Yow, C.M. and Omar, S.Z. (2007) Effect of coital activity on onset of labor in women scheduled for labor induction - A randomized controlled trial. Obstetrics and Gynecology, 110 (4). pp. 820-826. ISSN 0029-7844, DOI https://doi.org/10.1097/01.AOG.0000267201.70965.ec.