RT Journal Article SR Electronic T1 At least 12 US states refuse to recognize physician training accredited in Canada JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1061 OP 1063 VO 158 IS 8 A1 Korcok, M. YR 1998 UL http://www.cmaj.ca/content/158/8/1061.abstract AB The easing of trade rules has done little to ease the movement of physicians between Canada and the US. Borders may be breaking down when it comes to the transfer of goods, Milan Korcok reports, but for physicians the moats in front of those borders appear to be getting deeper and more difficult to cross.