Affiliation: | 1. Department of Surgery, Baystate Medical Center, Springfield, MA 01199, USA;2. Tufts University School of Medicine, Boston, MA, USA;1. Department of Surgery and Perioperative Science, Umeå University, SE-901 87 Umeå, Sweden;2. Department of Surgery, Sundsvall Hospital, SE-851 86 Sundsvall, Sweden |