title: [Questionnaires as research tools--Social Insurance Institution's Sleep Habit Questionnaire as an example].
mesh_terms: D005387:Finland; D006801:Humans; D015203:Reproducibility of Results; D012107:Research Design; D012890:Sleep / Q000502:physiology; D012893:Sleep Wake Disorders / Q000175:diagnosis; D011795:Surveys and Questionnaires
vernacular_title: Kyselylomake tutkimusvälineenä--esimerkkinä kansaneläkelaitoksen unikyselylomake.