TY - JOUR T1 - "Any other comments?" Open questions on questionnaires - a bane or a bonus to research? JO - BMC Med Res Methodol UR - http://eprints.whiterose.ac.uk/9717/ PY - 2004/11/08 AU - O'Cathain A AU - Thomas KJ ED - DO - DOI: 10.1186/1471-2288-4-25 VL - 4 SP - 25 Y2 - 2025/05/30 ER -