0121-4500 0121-4500 S0121-45002019000300271 10.15446/av.enferm.v37n3.82346 Bélgica 00 12 2019 00 12 2019 37 3 271 274 (1) 2015 (2) 1997 (3) 2019 26 1 1 (4) 2001 (5) 2019 76 155-70 (6) 1978 26 113-20 (7) 2011 (8) 2017 11 3 3 231-44 (9) 2013 349-80