RT Journal Article SR Electronic T1 Controls in studies of magnetism JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 327 OP 327-a DO 10.1503/cmaj.1070163 VO 178 IS 3 A1 Max H. Pittler, MD PhD YR 2008 UL http://www.cmaj.ca/content/178/3/327.2.abstract