2007-4085 2007-4085 S2007-40852020000200004 10.48193/rmu.v80i2.594 México México Mexico México 00 04 2020 00 04 2020 80 2

1 2003 348 7 7 651-6 2 2014 41 5 5 473 3 The Cochrane Collaboration 2008 4 2005 19 50 50 51-4 5 2012 380 9857 9857 1927-35 6 2002 30 4 4 221-5 7 1972 48 556 556 69-75 8 2000 160 21 21 3294 9 1973 51 10 2002 23 4 4 217-8 11 1973 12 2002 23 4 4 217-8