[1] Harvard Med Sch, Program Global Surg & Social Change, Boston, MA 02115 USA
[2] McGill Univ, Montreal, PQ, Canada
[3] Montreal Childrens Hosp, Harvey E Beardmore Div Pediat Surg, Montreal, PQ, Canada
[4] Univ Pernambuco, Fac Med Sci, Recife, PE, Brazil
[5] Inst Educ Med IDOMED Estacio, Vista Carioca Campus, Rio De Janeiro, RJ, Brazil
[6] Univ Estadual Campinas, Med Sch, Dept Paediat Surg, Campinas, SP, Brazil
[7] Univ Fed Bahia, Dept Anaesthesia & Surg, Salvador, BA, Brazil
[8] Univ Hlth Network, Dept Surg, Div Urol, Toronto, ON, Canada
[9] Boston Childrens Hosp, Dept Pediat Surg, Boston, MA USA
[10] Tech Univ Munich, Sch Med & Hlth, Epidemiol, Munich, Germany
[11] Univ Estado Amazonas, Hlth Sci Sch, Manaus, AM, Brazil
[12] Univ Fed Sao Paulo, Dept Surg, Sao Paulo, SP, Brazil
[13] Brazilian Coll Surg, Rio De Janeiro, RJ, Brazil
[14] Univ Fed Sao Paulo, Discipline Anaesthesiol Pain & Crit Care Med, Sao Paulo, SP, Brazil
[15] Brazilian Soc Anaesthesiol, Int Affairs, Rio De Janeiro, Brazil
[16] Univ Sao Paulo, Dept Surg, Sao Paulo, SP, Brazil
[17] Boston Childrens Hosp, Dept Plast & Oral Surg, Boston, MA USA