[1] Univ Kebangsaan Malaysia UKM, Fac Med, Dept Obstet & Gynaecol, Kuala Lumpur, Malaysia
[2] Univ Kebangsaan Malaysia UKM, Fac Med, Dept Obstet & Gynaecol, Paediat & Adolescent Gynaecol PAG Unit, Kuala Lumpur, Malaysia
[3] Univ Malaya, Fac Med, Dept Primary Care Med, Kuala Lumpur, Malaysia
[4] Univ Kebangsaan Malaysia UKM, Hosp Tunku Ampuan Besar Tuanku Aishah Rohani, Fac Med, Dept Paediat, Kuala Lumpur, Malaysia