00291nas a2200133   4500000000100000000000100001008004100002260003100043653001300074100001900087700001800106245002100124300001200145       2009                            d  bDe Gruyter, SauraMünchen10aBillroth1 aChristian Pape1 aWolfgang Benz00aTheodor Billroth  a84–85