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