1 Institute of Health and Society, Department of Community Medicine and Global Health, University of Oslo, P.O. Box 1130, Blindern, 0318, Oslo, Norway. s.e.ahmed@medisin.uio.no.
2 Institute of Health and Society, Department of Community Medicine and Global Health, University of Oslo, P.O. Box 1130, Blindern, 0318, Oslo, Norway.
Following publication of the original article [1], we have been notified that one of the authors' names was mentioned twice. Currently the authors are stated as.