title: Comment: The dilemma of differential diagnosis: a reply to Ernst et al.
mesh_terms: D000368:Aged; D001927:Brain Diseases / Q000175:diagnosis*; D002908:Chronic Disease; D003863:Depression / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004644:Emotions; D006801:Humans; D012934:Social Isolation; D013577:Syndrome