RT Journal Article SR Electronic T1 Variations in mortality rates among Canadian neonatal intensive care units: interpretation and implications JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 191 OP 192 VO 166 IS 2 A1 Jon Tyson A1 Kathleen Kennedy YR 2002 UL http://www.cmaj.ca/content/166/2/191.abstract