Procedural pain in newborns at risk for neurologic impairment. - Stevens,B.; Mc,P.Grath.; Gibbins,S.; Beyene,J.; Breau,L.; Camfield,C.; Finley,A.; Franck,L.; Howlett,A.; Mc,P.Keever.; O'Brien,K.; Ohlsson,A.; et al. (Pain, 2003)