Haeuser, WinfriedWinfriedHaeuserKlose, P.P.KloseWelsch, P.P.WelschPetzke, FrankFrankPetzkeNothacker, M.M.NothackerKopp, I.I.Kopp2018-11-072018-11-072015https://resolver.sub.uni-goettingen.de/purl?gro-2/36699312Methods Report of the updated Guideline "Long Term Use of Opioids in non-tumor-related Pain - LONTS" (vol 29, pg 8, 2015)journal_article10.1007/s00482-015-0009-126022431000357432700010