0121-8123 0121-8123 S0121-81232017000100048 10.1016/j.rcreu.2016.08.002 Ecuador Ecuador 00 03 2017 00 03 2017 24 1 48 53

1 1862 2 1901 71 403-5 3 1965 36 73-88 4 2016 Primera 103 5 1999 42 41 6 1996 55 7 7 2012 8 79 8 2015 9 1997 40 734-42 10 1983 22 157-8 11 1990 301 2 12 1997 24 89 13 2007 46 9 14 1980 23 183-9 15 1998 41 1111-8 16 1957 32 678 17 2012 12 18 2013 19 (NIOSH) National Institute for Occupational Safety and Health 1976 76-141 20 2005 9 244-7 21 2009 26 146-51 22 1990 97 487-9 23 1973 16 28 24 2000 27 155-60 25 2009 19 219-28 26 2009 360 1989-2003 27 2008 58 3902-12 28 2013 113 482-8