two recently published meta-analyses of controlled trials of a wide variety of progestational agents , used in pregnancy ( daya 1989 ; goldstein et al . 1989 ) , prompted this third meta-analysis of placebo-controlled trials involving the prophylactic use of a single agent , 17 alpha-hydroxyprogesterone caproate .
C0032961
pregnancy
C0044971
17 alpha-hydroxyprogesterone caproate