TY - JOUR T1 - The lucky penny: an illustration of the bullet rule JF - Canadian Medical Association Journal JO - CMAJ SP - 63 LP - 65 DO - 10.1503/cmaj.110210 VL - 184 IS - 1 AU - Paul T. Engels AU - Homer C. Tien Y1 - 2012/01/10 UR - http://www.cmaj.ca/content/184/1/63.abstract ER -