RT Journal Article SR Electronic T1 Tracheal calcification JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 291 OP 291 DO 10.1503/cmaj.070099 VO 179 IS 3 A1 Jo, Sang-Ho A1 Choi, Young-Jin A1 Cho, Goo-Yeong A1 Kim, Hyun-Sook A1 Jung, Ki-Suck A1 Rhim, Chong-Yun YR 2008 UL http://www.cmaj.ca/content/179/3/291.abstract