The challenging biospecimen collection setting and differences among partner organizations complicated the process of uniform data collection for donor characteristics. For example, data related to the health of the donor could have been derived from multiple sources, including the donor's medical record (if available) and information from the donor's next-of-kin. Accordingly, additional CDR data fields were included to annotate the source of various information reported. Terminology related to data elements, such as medication name and medical condition or cause of death, varied across the BSSs, most often due to the use of similar but different terms or synonyms.
