Influence of different methods for calculating gestational age at birth on prematurity and small for gestational age proportions: a systematic review with meta-analysis by Gabriela Luiza Nogueira Vitral, Roberta Maia de Castro Romanelli, Tiago Alves Leonel, Juliano de Souza Gaspar, Regina Amélia Lopes Pessoa de Aguiar, Zilma Silveira Nogueira Reis

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