Semantic similarity matrix for DO terms. Legend: AA, alopecia areata; ARa, cerebral arteritis; ARb, temporal arteritis; ARc, Takayasu arteritis; ARd, polyarteritis nodosa; AT, autoimmune thyroid disease; CD, coeliac disease; DM, dermatomyositis; PB, primary biliary cirrhosis; PN, autonomic peripheral neuropathy; RAa, rheumatoid arthritis; RAb, juvenile rheumatoid arthritis; VI, vitiligo.