[1] Hosp Infanta Cristina, Deaprtment Gen Surg, Cordoba, Spain
[2] Canc Treatment Ctr Amer, Dept Surg Oncol, Philadelphia, PA USA
[3] Univ Calif San Diego, Div Surg Oncol, Moores Canc Ctr, San Diego, CA 92103 USA
[4] Canc Treatment Ctr Amer, Dept Med Oncol, Philadelphia, PA USA
[5] St George Hosp, Hepatobiliary & Surg Oncol Unit, Sydney, NSW, Australia
[6] Univ Wurzburg, Dept Surg, D-97070 Wurzburg, Germany
[7] Natl Canc Inst, Dept Surg, I-20133 Milan, Italy
[8] St Johns Hosp, Dept Surg Oncol, Detroit, MI USA
[9] Hosp San Jaime, Gen Surg Serv, Alicante, Spain
[10] Inst Jalisciense Cancerol, Dept Surg Oncol, Guadalajara, Jalisco, Mexico
[11] Ctr Hosp Lyon Sud, Dept Surg Oncol, F-69310 Pierre Benite, France
[12] San Jose Hosp, Dept Surg, Vitoria, Spain
[13] MD Anderson Canc Ctr, Dept Surg Oncol, Madrid, Spain
[14] Tufts Med Ctr, Dept Surg Oncol, Boston, MA USA
[15] Metaxa Canc Mem Hosp, Dept Gynecol, Piraeus, Greece
[16] Univ Miami, Dept Surg Oncol, Miami, FL USA
[17] Hosp Lariboisiere, Dept Surg, Paris, France
[18] Univ Illinois, Dept Surg Oncol, Champaign, IL 61820 USA
[19] Mercy Med Ctr, Dept Surg Oncol, Baltimore, MD USA
[20] Loma Linda Univ, Med Ctr, Dept Surg Oncol, Loma Linda, CA 92350 USA
[21] Hosp Torrecardenas, Dept Surg Oncol, Almeria, Spain
[22] Med Coll Wisconsin, Dept Surg, Milwaukee, WI 53226 USA
[23] Rutgers State Univ, Dept Stat, New Brunswick, NJ 08903 USA