2312-3893 2312-3893 S2312-38932018000200085 10.18004/rvspmi/2312-3893/2018.05(02)85-088 Paraguay 00 09 2018 00 09 2018 5 2 85 88

1 2009 302 9 9 985-93 2 2011 32 1 1 141-6 3 1985 93 2 2 146-7 4 2010 39 2 2 147-51 5 2001 59 3-B 3-B 733-9 6 2014 186 12 12 917-22