1517-9702 1517-9702 S1517-97022014000401093 10.1590/S1517-97022014071545 Brazil 00 12 2014 00 12 2014 40 4 1093 1108

19 2 2 889-106 28 3 3 303-32 9 1 1 101-35 21 71 71 21-44 12 23 23 37 4 4 863-69