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Alberdi-Saugstrup M, Zak M, Nielsen S, Herlin T, Nordal E, Berntson L, Fasth A, Rygg M, Klaus Müller; Nordic Study Group of Pediatric Rheumatology (NoSPeR).Alberdi-Saugstrup M, et al. Among authors: fasth a.Rheumatol Int. 2017 May;37(5):695-703. doi: 10.1007/s00296-017-3657-x. Epub 2017 Mar 10.Rheumatol Int. 2017.PMID: 28283733