Meyer Haakon E, Holvik Kristin, Lips Paul
Norwegian Institute of Public Health, Division of Epidemiology, Box 4404, Nydalen, 0403 Oslo, Norway University of Oslo, Department of Community Medicine, Oslo, Norway
Norwegian Institute of Public Health, Division of Epidemiology, Box 4404, Nydalen, 0403 Oslo, Norway.
BMJ. 2015 Jan 29;350:h321. doi: 10.1136/bmj.h321.