作者单位：Hosp Especialidades Ctr Med La Raza, Ctr Med Nacl Siglo XXI, Inst Mexicano Seguro Social, Med Res[1]Univ Toronto Mississauga, Dept Anthropol, Mississauga, ON, Canada[2]McMaster Univ, Dept Hlth Res Methods Evidence & Impact, Hamilton, ON, Canada[3]
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