TY - GEN AU - McArthur,Eric TI - Diagnostic accuracy in the presence of a rare outcome SN - 1488-2329 PY - 2019///0923 KW - Photoplethysmography KW - Sensitivity and Specificity KW - Smartphone KW - Ulnar Artery N1 - Publication Type: Letter; Comment UR - https://doi.org/10.1503/cmaj.70492 ER -