title: Thinker's sign.
authors.affiliation: Department of Internal Medicine, Mayo Clinic, USA.
authors.forename: Sandeep M
authors.initials: SM
authors.lastname: Patel
authors.forename: Jay H
authors.initials: JH
authors.lastname: Ryu
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sekiguchi
mesh_terms: D000368:Aged; D004550:Elbow / Q000473:pathology; D006801:Humans; D017495:Hyperpigmentation / Q000209:etiology / Q000473:pathology; D007642:Keratosis / Q000209:etiology / Q000473:pathology; D008297:Male; D011187:Posture; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications* / Q000473:pathology / Q000503:physiopathology