2236-3459 2236-3459 S2236-34592014000100187 10.1590/S2236-34592014000100011 Sweden 00 04 2014 00 04 2014 18 42 187 207

4 8 8 79-109 74 74 7-23 . 211-. 228 8 8 113-18 3 3 39-41 27 27 36-78 24 24 66-97