RT Journal Article SR Electronic T1 A 69-year-old man with a thick dark pigmentation on his hands, and low back pain JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1761 OP 1762 VO 28 IS 11 A1 El-Khushman, Haytham M. YR 2007 UL http://smj.org.sa/content/28/11/1761.abstract AB