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† Additional information available at http://www. surveysampling. com. § A survey response rate requires specification of the denominator at each stage of sampling. During recruitment of an online opt-in survey sample, such as the Internet panel described in this report, these numbers are not available; therefore, the response rate cannot be calculated. Instead, the survey completion rate is provided.

¶ Ambulatory/physician office included physician’s offices, medical clinics, and other ambulatory care settings. LTCF included nursing homes, home health agencies, assisted living settings, or other LTCF. Other clinical setting included dental offices or clinics, pharmacies, laboratories, public health settings, medical, nursing, or other health-care education settings, emergency medical services settings, or other settings where clinical care or related services were provided to patients.