@article {Mullican:September 2001:0149-2918:1429, author = "Mullican W.S.", author = "Lacy J.R.", author = "TRAMAP-ANAG-006 Study Group", title = "Tramadol/acetaminophen combination tablets and codeine/acetaminophen combination capsules for the management of chronic pain: a comparative trial", journal = "Clinical Therapeutics", volume = "23", year = "September 2001", abstract = "", pages = "1429-1445(17)", url = "http://www.ingentaconnect.com/content/els/01492918/2001/00000023/00000009/art80118" doi = "doi:10.1016/S0149-2918(01)80118-1" }