Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics

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Referenz

Fraser GE, Yan R, Butler TL, Jaceldo-Siegl K, Beeson WL, Chan J.
Missing data in a long food frequency questionnaire: are imputed zeroes correct?.

Epidemiology 2009;
20 (02) 289-294 . Doi: 10.1097/EDE.0b013e31819642c4

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