RT Journal Article SR Electronic T1 Sample size and study interpretation JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1208 OP 1208 DO 10.1503/cmaj.1040153 VO 170 IS 8 A1 Max H. Pittler A1 Edzard Ernst YR 2004 UL http://www.cmaj.ca/content/170/8/1208.1.abstract