Department of Occupational, Social and Environmental Medicine, University Medical Center Göttingen, Waldweg 37 B, D-37073 Göttingen, Germany Professor of Primary Care Epidemiology, Arthritis Research UK Primary Care Centre, Keele University, ST5 5BG, UK *Tel.: +49 551 398044; fax: +49 551 396184. E-mail address:[email protected] Article history: Received 25 February 2013; Accepted 12 March 2013.
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Straube et al. (2013) studied this question.
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