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Several web-based search engines have been developed to assist individuals to find clinical trials for which they may be interested in volunteering. However, these search engines may be difficult for individuals with low health and computer literacy to navigate. The authors present findings from a usability evaluation of clinical trial search tools with 41(More)
The visual design of virtual agents presents developers with a very large number of choices. We conducted a series of studies using Amazon's Mechanical Turk that demonstrate that there are no design universals for characters, optimal design of character proportion and rendering style depends on the task domain and user characteristics. Specifically, we(More)
BACKGROUND Conventional Web-based search engines may be unusable by individuals with low health literacy for finding health-related information, thus precluding their use by this population. OBJECTIVE We describe a conversational search engine interface designed to allow individuals with low health and computer literacy identify and learn about clinical(More)
A virtual agent that explains research informed consent documents to study volunteers is described, along with a series of development efforts and evaluation studies. A study of nurse administration of informed consent finds that human explanations follow the structure of the document, and that much of information provided verbally is not contained in the(More)
The design and evaluation of a web-based search engine for cancer clinical trials is described. The search task is framed as a conversation with an animated agent in order to make it accessible to individuals with low health and computer literacy. Preliminary evaluation comparing the agent to a conventional keyword-based search interface indicates that the(More)
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