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Risks of the Minimal Access Approach for Laparoscopic Surgery: Multivariate Analysis of Morbidity Related to Umbilical Trocar Insertion[J] . Julio Mayol,Julio Garcia-Aguilar,Elena Ortiz-Oshiro,Jose A. De-Diego Carmona,Jesus A. Fernandez-Represa.World Journal of Surgery . 1997 (5)