[Possible bias in the selection of the control group].
Velasco Mondragón
H E
HE
Leyva López
A
A
Briseño Tavez
F
F
Escobar Meza
J
J
Fuentes Domínguez
J
J
Fuentes Román
L
L
Jiménez Gallegos
L
L
D000293:Adolescent; D016022:Case-Control Studies; D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D015983:Selection Bias