Sleep quality, fatigue, and health-related quality of life in patients on initial peritoneal dialysis and multiple modalities after two years : a prospective studyYngman-Uhlin, Pia; Kjellsdotter, Anna; Uhlin, Nils Fredrik Arne; Edell-Gustafsson, UllaNephrology nursing journal2019 / p. 615–649 https://library.annanurse.org/anna/articles/2494/view