Full text: Available Index: LILACS (Americas) Main subject: Outcome and Process Assessment, Health Care / Health Services / National Health Programs Type of study: Evaluation studies / Prognostic study / Systematic review of observational studies Country/Region as subject: Mexico Language: Spanish Journal: Salud pública Méx Journal subject: Public Health Year: 2011 Type: Article Affiliation country: Mexico Institution/Affiliation country: Universidad Autónoma Metropolitana-Xochimilco/MX