Representativeness, losses to follow-up and validity in cohort studies.
Alonso
Alvaro
A
de Irala
Jokin
J
Martínez-González
Miguel Angel
MA
D015331:Cohort Studies; D006801:Humans; D010352:Patient Dropouts; D015203:Reproducibility of Results; D015983:Selection Bias; D013030:Spain