1137-6627 1137-6627 S1137-66272018000300397 10.23938/assn.0375 Spain Spain Spain Spain Spain Spain Spain Spain 00 12 2018 00 12 2018 41 3 397 400 1 2018 41 161-9 2 2018 30 135-6 3 1988 167 400 4 2018 41 157-60 5 2018 30 3-4