RT Journal Article SR Electronic T1 Elevated levels of b-human chorionic gonadotropin and human placental lactogen between 11-13 weeks' gestation and subsequent pregnancy complications in Omani women JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 382 OP 384 VO 25 IS 3 A1 Krolikowski, Andrzej A1 Al Busaidi, Fikra A1 Al Wahaibi, Adil YR 2004 UL http://smj.org.sa/content/25/3/382.abstract AB