0120-3347 0120-3347 S0120-33472018000200178 10.1097/cj9.0000000000000035 Mexico Mexico 00 06 2018 00 06 2018 46 2 178 179 1 2017 45 159-65 2 1999 7 3 2010 152 726-32 4 2013 66 817 5 2007 61 47-56 6 2013 30 70-4 7 2017 20