title: Users' guide to the surgical literature: how to assess power and sample size. Laparoscopic vs open appendectomy.
authors.affiliation: St. Joseph's Healthcare, Department of Surgery, Surgical Outcomes Research Centre, McMaster University, Hamilton Health Sciences, Hamilton, Ontario. mocadeddu@yahoo.com
authors.forename: Margherita
authors.initials: M
authors.lastname: Cadeddu
authors.forename: Forough
authors.initials: F
authors.lastname: Farrokhyar
authors.forename: Achilleas
authors.initials: A
authors.lastname: Thoma
authors.forename: Ted
authors.initials: T
authors.lastname: Haines
authors.forename: Anna
authors.initials: A
authors.lastname: Garnett
authors.forename: Charles H
authors.initials: CH
authors.lastname: Goldsmith