Relation of surgical volume to outcome in eight common operations. - Khuri,S.F.; Daley,J.; Henderson,W.; Hur,K.; Hossain,M.; Soybel,D.; Kizer,K.W.; Aust,J.B.; Bell,R.H.; Chong,V.; Demakis,J.; Fabri,P.J.; et al. (Ann Surg, 1999)