Authors: Alvaro Proaño; Marjory A Bravard; Brian H Tracey; José W López; German Comina; Mirko Zimic; Jorge Coronel; Gwenyth O'Neil Lee; Luz Caviedes; Jose Luis Cabrera; Antonio Salas; Eduardo Ticona; Daniela E Kirwan; Jon S Friedland; Carlton A Evans; David A Moore; Robert H Gilman Journal: BMJ Open Date: 2016-04-22 Impact factor: 2.692