RT Journal Article SR Electronic T1 Acute calcific retropharyngeal tendonitis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 995 OP 995 DO 10.1503/cmaj.140214 VO 187 IS 13 A1 Yasuaki Tagashira A1 Satoshi Watanuki YR 2015 UL http://www.cmaj.ca/content/187/13/995.abstract