RT Journal Article SR Electronic T1 Calcium pyrophosphate deposition and crowned dens syndrome JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 206 OP 207 DO 10.3949/ccjm.88a.21008 VO 88 IS 4 A1 Ann K. Rosenthal YR 2021 UL http://www.ccjm.org/content/88/4/206.abstract AB