RT Journal Article SR Electronic A1 Hudec, Roman T1 The treatment of severe pain in Canada should be followed JF Biomedical papers YR 2012 VO 156 IS 4 SP 385 OP 385 DO 10.5507/bp.2012.113 UL https://biomed.papers.upol.cz/artkey/bio-201204-0015.php AB