- 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 June 26, 2017
- Revised August 31, 2017
- Accepted October 2, 2017
- First published December 5, 2017.
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