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