Erratum to "The Pelvic Girdle Pain deadlock: 2. Topics that, so far, have remained out of focus" [Muscoskel. Sci. Pract. 48 (2020) 102166]. (December 2020) - Meijer, O.G.; Barbe, M.F.; Prins, M.R.; Schipholt, I.J. Lutke; Hu, H.; Daffertshofer, A.