Evaluation of the 9-item Patient Health Questionnaire (PHQ-9) as an assessment instrument for symptoms of depression in patients with multiple sclerosis. Sjonnesen K, Berzins S, Fiest KM, M Bulloch AG, Metz LM, Thombs BD, Patten SB Postgrad Med. 2012 Sep; 124(5):69-77. PMID: 23095427. Abstract CommentRecommendBookmarkWatch