From the Departments of Surgery (C.-G.N., T.B., T.S., O.L.), Karolinska Hospital, and Microbiology and Tumorbiology Center (M.K., R.M.), Karolinska Institute, Stockholm, Sweden.
Address for reprints: Carl-Gustaf Nettelbladt, MD, PhD, Department of Surgery, Södertälje Hospital, S-152 40 Södertälje, Sweden.
Submitted for publication August 20, 1997.
Accepted for publication October 29, 1999.