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Hrafnkelsson H, Magnusson KT, Sigurdsson EL, Johannsson E.Hrafnkelsson H, et al. Among authors: sigurdsson el.Scand J Prim Health Care. 2009;27(3):186-91. doi: 10.1080/02813430903155028.Scand J Prim Health Care. 2009.PMID: 19731182Free PMC article.
Hrafnkelsson H, Magnusson KT, Thorsdottir I, Johannsson E, Sigurdsson EL.Hrafnkelsson H, et al. Among authors: sigurdsson el.Scand J Prim Health Care. 2014 Dec;32(4):149-55. doi: 10.3109/02813432.2014.982363. Epub 2014 Nov 26.Scand J Prim Health Care. 2014.PMID: 25424464Free PMC article.Clinical Trial.