title: [Erratum to: Opioids for chronic non-tumor-related pain--are not opioid analgesics superior? Systematic Review and Meta-analysis of Efficacy, tolerability and safety in randomized direct comparison of opioids and non-opioid analgesia for at least 4 weeks].
abstract: Fig. 1 is slightly flawed as shown (the last line is missing). We enter the picture again correctly.
authors.affiliation: Stichting Rugzorg Nederland, Ede, Niederlande.
authors.forename: P
authors.initials: P
authors.lastname: Welsch
authors.forename: C
authors.initials: C
authors.lastname: Sommer
authors.forename: M
authors.initials: M
authors.lastname: Schiltenwolf
authors.forename: W
authors.initials: W
authors.lastname: Häuser