RT Journal Article SR Electronic T1 Ensuring balanced groups in surgical trials JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP 418 OP 423 VO 53 IS 6 A1 Forough Farrokhyar A1 Sohail Bajammal A1 Kamyar Kahnamoui A1 Mohit Bhandari YR 2010 UL http://canjsurg.ca/content/53/6/418.abstract