2007-5057 2007-5057 S2007-50572018000100083 10.1016/j.riem.2017.01.149 Peru 00 03 2018 00 03 2018 7 25 83 84 1. 2016 5 19 19 155-63 2. 2013 18 1 1 3. 2008 69 1 1 42-5 4. 2014 17 3 3 171-7