Additional file 3.
Table 1. Summary of Participant Demographics. This describes basic demographic features of survey participants broken down by survey method and sample source. We divided investigator sample source into those who responded by telephone and internet to determine whether demographic characteristics varied more by sample source or self-selected method of completion of the survey.
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Willison et al. BMC Medical Ethics 2009 10:10 doi:10.1186/1472-6939-10-10