The associations of social and behavioural factors on preterm birth in Singapore were studied using hospital maternity records of 20,723 consecutive singleton births between January 1986 and November 1991. The overall proportion of preterm births was 3.6
作者:W P, Leong;O A, Viegas;S S, Ratnam
来源:Journal of biosocial science 1993 年 25卷 4期