[1] INICC, RA-1195 Buenos Aires, DF, Argentina
[2] Pushpanjali Crosslay Hosp, Ghaziabad, India
[3] Ondokuz Mayis Univ, Sch Med, Samsun, Turkey
[4] St Lukes Med Ctr, Quezon City, Philippines
[5] Clin Santa Maria, Sucre, Colombia
[6] Ctr Med La Raza IMSS, Mexico City, DF, Mexico
[7] Inst Nacl Enfermedades Neoplas, Lima, Peru
[8] Hosp Sao Paulo, Sao Paulo, Brazil
[9] Special Hosp Surg Dis Filip Vtori, Skopje, North Macedonia
[10] Univ Hosp Herakl, Iraklion, Greece
[11] Shanxi Dayi Hosp, Taiyuan, Peoples R China
[12] Indus Hosp, Karachi, Pakistan
[13] Amer Univ Beirut, Med Ctr, Beirut, Lebanon
[14] Hosp Nacl Ninos Benjamin Bloom, San Salvador, El Salvador
[15] Lithuanian Univ Hlth Sci, Pediat Clin, Kaunas, Lithuania
[16] Clin Hosp San Fernando, Panama City, Panama
[17] Hosp Docente Clin Quirurg Joaquin Albarran Doming, Havana, Cuba
[18] Hosp Clin Bibl, San Jose, Costa Rica
[19] Univ Hosp Wroclaw, Wroclaw, Poland