[1] St Agnes Hosp, Baltimore, MD USA
[2] Univ N Dakota, Altru Hosp, Grand Forks, ND 58201 USA
[3] Washington Hosp Ctr, Washington, DC 20010 USA
[4] Wake Forest Univ, Winston Salem, NC 27109 USA
[5] Univ Maryland, Baltimore, MD 21201 USA
[6] Natl Canc Inst, I-20133 Milan, Italy
[7] Univ Pittsburgh, Med Ctr, Pittsburgh, PA USA
[8] Sharp HealthCare, San Diego, CA USA
[9] Hosp San Pablo, Barcelona, Spain
[10] Baltimore Washington Med Ctr, Glen Burnie, MD USA
[11] Hosp San Jaime, Torrevieja, Spain
[12] Walnut Creek Kaiser Permanente, Walnut Creek, CA USA
[13] St George Hosp, Sydney, NSW, Australia
[14] Louisiana State Univ Hlth Sci Ctr, Shreveport, LA 71105 USA
[15] Crete Univ Hosp, Sch Med, Iraklion, Greece
[16] Inst Nacl Cancerl, Mexico City, DF, Mexico
[17] Inst Gustave Roussy, Villejuif, France
[18] Creighton Univ, Sch Med, Omaha, NE USA
[19] Osped S Camillo Forlanini, Rome, Italy
[20] Univ Lyon, Lyon, France
[21] Policlin San Jose, Vitoria, Spain
[22] Hosp Gen Univ Gregorio Maranon, Madrid, Spain
[23] MD Anderson Espana, Madrid, Spain
[24] Dorothy E Schneider Canc Ctr, San Mateo, CA USA
[25] Mercy Med Ctr, Baltimore, MD USA
[26] Univ Med & Dent New Jersey, Newark, NJ 07103 USA
[27] Surg Oncol Associates, Newport News, VA USA
[28] Roswell Pk Canc Ctr, Buffalo, NY USA
[29] First Surg Univ Hosp, Belgrade, Serbia
[30] Univ S Florida, H Lee Moffitt Canc Ctr, Tampa, FL 33682 USA
[31] Baylor Univ, Med Ctr, Dallas, TX USA
[32] Johns Hopkins Univ Hosp, Baltimore, MD 21287 USA
[33] Akad Univ Hosp, Uppsala, Sweden
[34] Univ Washington, Seattle, WA 98195 USA
[35] Univ Louisville, Louisville, KY 40292 USA
[36] Helen F Graham Canc Ctr, Newark, DE USA
[37] N Hampshire Hosp, Basingstoke, Hants, England
[38] Hosp Med Sur, Tlalpan, Mexico
[39] Kantonsspital, Dept Surg, St Gallen, Switzerland
[40] NCI, Bethesda, MD 20892 USA
[41] Univ Regensburg, D-8400 Regensburg, Germany
[42] Dekalb Med Ctr, Decatur, GA USA
[43] St Lukes Hosp, Bethlehem, PA USA
[44] Maine Med Ctr, Portland, ME 04102 USA
[45] Miami Valley Hosp, Xenia, OH USA
[46] Tel Aviv Sourasky Med Ctr, Tel Aviv, Israel
[47] Beebe Med Christiana Care, Lewes, DE USA
[48] Walter Reed Army Med Ctr, Washington, DC 20307 USA
[49] Hosp Torrecardenas, Almeria, Spain
[50] Fairview Univ, Med Ctr, Minneapolis, MN USA