A patient/client survey can yield valuable information.
Shoup
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D003625:Data Collection / Q000379:methods*; D003812:Dentist-Patient Relations; D006801:Humans; D017060:Patient Satisfaction / Q000706:statistics & numerical data*; D011215:Practice Management, Dental / Q000706:statistics & numerical data*; D011369:Professional-Patient Relations; D011795:Surveys and Questionnaires