Fig. 4

Differential diagnoses given by WebMD compared with diagnoses made in clinic according to established classification criteria. Different symbols reflect the 1st, 2nd, 3rd, 4th and 5th diagnoses given by WebMD as shown in the key within the Figure. Only diagnoses given by Web MD to more than 1 patient are shown. Twenty-seven additional diagnoses were listed once by WebMD, these are shown in the Additional file 1. RA rheumatoid arthritis, PsA psoriatic arthritis, OA osteoarthritis, ACL anterior cruciate ligament, CREST CREST syndrome (Calcinosis, Raynaud’s phenomenon, Esophageal dysmotility, Sclerodactyly, and Telangiectasia), SLE systemic lupus erythematosus