High data quality is achieved using standard data entry fields (numeric, date, time, dropdown, radio, checkbox fields, open text, etc.) as well as applying standard validation rules (mandatory, ranges for dates/numeric fields, data type, etc.) Predefined code lists are used to ensure that only standardized values are chosen. Clinical data is entered via forms comprised mainly of checkboxes, drop down menus and specified value fields. A few open text box fields capture natural history and individual participant experiences. Built-in data checks prevent most errors during data entry, further contributing to the ease of use for a non-technical user.