RT Journal Article SR Electronic T1 Cardiac platypnea-orthodeoxia syndrome in a 73-year-old woman JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1385 OP 1388 DO 10.1503/cmaj.141525 VO 187 IS 18 A1 Khai-Jing Ng A1 Yi-Da Li YR 2015 UL http://www.cmaj.ca/content/187/18/1385.abstract