RT Journal T1 CHronic indurated gingival ulceration—quiz case JF Archives of Dermatology JO Archives of Dermatology YR 2010 FD November 1 VO 146 IS 11 SP 1301 OP 1306 DO 10.1001/archdermatol.2010.318-a UL http://dx.doi.org/10.1001/archdermatol.2010.318-a AB