Carlsson Lennart, Morgell Roland, Strender Lars-Erik, Arrelöv Britt, Nilsson Gunnar H
Department of Neurobiology, Caring Sciences and Society, Center for Family and Community Medicine, Karolinska Institutet, Huddinge, Sweden.
BMC Public Health. 2009 May 27;9:157. doi: 10.1186/1471-2458-9-157.