RT Journal Article SR Electronic T1 The cost of living: tracing the supply chain for superconductors in MRI machines JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E762 OP E764 DO 10.1503/cmaj.101334 VO 183 IS 11 A1 David Pantalony YR 2011 UL http://www.cmaj.ca/content/183/11/E762.abstract