作者单位:Univ Buenos Aires, Hosp Aleman Buenos Aires, Dept Surg, Buenos Aires, DF, Argentina[1]Univ N Carolina, Dept Med & Surg, Chapel Hill, NC USA[2]Univ Fed Sao Paulo, Escola Paulista Med, Dept Surg, Sao Paulo, Brazil[3]Univ Torino, Dept Surg Sci, Turin, Italy[4]