RT Journal Article SR Electronic T1 Black hairy tongue JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 847 OP 848 DO 10.3949/ccjm.75a.08023 VO 75 IS 12 A1 Sergio Vañó-Galván A1 Pedro Jaén YR 2008 UL http://www.ccjm.org/content/75/12/847.abstract AB