title: Medical questionnaires are copyrighted to ensure that validity is maintained.
authors.affiliation: Dr. Juniper is Professor Emeritus, Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada. Electronic address: juniper@qoltech.co.uk.
authors.forename: Elizabeth F
authors.initials: EF
authors.lastname: Juniper
mesh_terms: D003309:Copyright; D011795:Surveys and Questionnaires / Q000592:standards