title: Letter: all that palpitates is not.
mesh_terms: D000328:Adult; D002110:Caffeine; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006980:Hyperthyroidism / Q000175:diagnosis*; D019966:Substance-Related Disorders / Q000175:diagnosis*
chemical_list: D002110:Caffeine