[Checking the validity unrepresentative .Debate on the paper by Narvai et al].
Czeresnia
Dina
D
Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil. dina@ensp.fiocruz.br
D003625:Data Collection / Q000379:methods / Q000592:standards; D003627:Data Interpretation, Statistical; D003753:Dental Health Surveys; D006801:Humans; D012107:Research Design / Q000592:standards*