作者单位：Inselspital Bern, University Hospital, Department of Pediatric Surgery, CH-3010 Bern, Switzerland[1]University Hospital Basel (UHB), Breast Center, Spitalstrasse 21, CH-4031 Basel, Switzerland, UHB[2]Sch?tzau and Simmen Institute for Biomathematics, Malzgasse 9, CH-4031 Basel, Switzerland[3]
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