InMS: Chronic insomnia disorder in multiple sclerosis - a Portuguese multicentre study on prevalence, subtypes, associated factors and impact on quality of life.
Viana P, Rodrigues E, Fernandes C, Matas A, Barreto R, Mendonça M, Peralta R, Geraldes R
Mult Scler Relat Disord. 2015 Sep; 4(5):477-83. PMID: 26346798.Abstract