title: Seasonal variation of primary neuropsychiatric systemic lupus erythematosus.
authors.forename: Gerda M
authors.initials: GM
authors.lastname: Steup-Beekman
authors.forename: Bastiaan M A
authors.initials: BM
authors.lastname: Gahrmann
authors.forename: Stefan C A
authors.initials: SC
authors.lastname: Steens
authors.forename: Mark A
authors.initials: MA
authors.lastname: van Buchem
authors.forename: Tom W J
authors.initials: TW
authors.lastname: Huizinga
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D002648:Child; D005260:Female; D006801:Humans; D008181:Lupus Nephritis / Q000453:epidemiology* / Q000473:pathology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009515:New Jersey / Q000453:epidemiology; D009518:New York / Q000453:epidemiology; D015995:Prevalence; D012621:Seasons; D012720:Severity of Illness Index