Questionnaire-based research in ophthalmology: questioning the quality.
Spokes
D M
DM
Buchan
J C
JC
D015982:Bias; D001699:Biometry; D006801:Humans; D009885:Ophthalmology / Q000592:standards*; D012106:Research / Q000592:standards; D011795:Surveys and Questionnaires / Q000592:standards*