[Precocious primiparity] [0.03%]
[过早初产]
P M Roa,A Arcay Solá,R Ecarri
P M Roa
[Pregnancy in the young] [0.03%]
[年轻妇女的妊娠]
T M Pittaluga,A J Vargas
T M Pittaluga
D Suárez,E Laguna,N Faría et al.
D Suárez et al.
[Adolescent pregnancy] [0.03%]
[青少年怀孕]
R Castellanos,O Agüero,G Franco et al.
R Castellanos et al.
[Premature detachment of the placenta in the Concepcion Maternity Hospital (1951-1964)] [0.03%]
Concepción妇产医院胎盘过早剥离情况（1951-1964）
O Leŏn Ponte,H Wallis,A Marcano Rivas et al.
O Leŏn Ponte et al.
O Rodríguez Armas,L E López,A Domínguez Gallegos et al.
O Rodríguez Armas et al.
R Aguiar-Nieto,D Chumaceiro,E Arzola et al.
R Aguiar-Nieto et al.