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LOW BACK PAIN IN SCHOOLCHILDREN: A CROSS-SECTIONAL STUDY IN A WESTERN CITY OF SÃO PAULO STATE, BRAZILFernandes, Júlio Alberto Agante; Genebra, Caio Vitor dos Santos; Maciel, Nicoly Machado; Fiorelli, Alexandre; Conti, Marta Helena Souza de; De Vitta, Alberto · Acta Ortopédica Brasileira · 2015