2236-3459 2236-3459 S2236-34592014000100009 10.1590/S2236-34592014000100002 Brazil 00 04 2014 00 04 2014 18 42 09 35

16 32 32 13-33 3 3 9-26 17 1 1 77-92 11 1 1 93-106