- Correspondence to Dr. Armando Peruga, Center for Epidemiology and Health Policy, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Av. Las Condes 12496, Lo Barnechea 7610658, Chile;
- Received 26 June 2017
- Revised 31 August 2017
- Accepted 2 October 2017
- Published online 5 December 2017.
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