Potential participants will be identified at their routine attendance of myositis clinics at participating centres, by the study PI. Before recruitment, each prospective candidate will be given a full explanation of the study, provided with a patient information sheet (PIS) and consent form to read, and given the opportunity to ask any questions that may arise. Once all questions have been answered and the Principal Investigator is assured that the individual understands what is required, informed consent can then be sought.