The number of study visits, duration and frequency will vary depending on the study design. Typically, the study visits are at least 30 minutes, however some may be a few hours. The initial visit (screening visit) will generally be longer as it will include an the informed consent process, an assessment of your medical history, collection of laboratory samples, and various study related questionnaires. During the informed consent process, participants will be provided detailed information regarding the study visits and overall duration of the study.