title: Erratum to 'A biopsychosocial primary care intervention (Back on Track) versus primary care as usual in a subgroup of people with chronic low back pain: protocol for a randomised, controlled trial' [JPHYS 61/3 (2015) 155].
authors.forename: Reni M A
authors.initials: RM
authors.lastname: van Erp
authors.forename: Ivan P J
authors.initials: IP
authors.lastname: Huijnen
authors.forename: Jeanine A
authors.initials: JA
authors.lastname: Verbunt
authors.forename: Rob J E M
authors.initials: RJ
authors.lastname: Smeets