Intense symptoms of pain are associated with poor sleep, fibromyalgia, depression and sleep apnea in patients with rheumatoid arthritis and psoriatic arthritis. A register-based study. - Weman L; Salo H; Kuusalo L; Huhtakangas J; Vähäsalo P; Backström M; Kärki J; Sokka-Isler T (Joint bone spine, 2024)