title: Persistent insomnia symptoms and its predictors by questionnaire survey.
authors.affiliation: Department of Hygiene and Public Health, Nippon Medical School, Tokyo 113-8602, Japan. Electronic address: kawada@nms.ac.jp.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Kawada
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology*