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机译:Calcaneal apophysitis: a quantitative radiographic evaluation of the secondary ossification center.
Department of Orthopaedics and Traumatology, University of Sao Paulo, School of Medicine of Ribeirao Preto. Av. Bandeirantes, 3900 Ribeirao Preto, SP, 14049-900 Brazil. jbvolpon@fmrp.usp.br;