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ClinicalTrials.gov is a registry and results database of federally and privately supported clinical trials conducted in the United States and around the world. ClinicalTrials.gov gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details. This information should be used in conjunction with advice from health care professionals.
GayData.org serves as a no-cost, open-access clearinghouse for the collection of sexual orientation & gender identity data and measures. This site also provides knowledgeable analysis, commentary and expert "how to" information on gathering such data effectively in scientific surveys, questionnaires and studies.