RT Journal
A1 Oleynikov D
T1 Proficiency, competency, and mastery: Comment on “technical proficiency in hand-assisted laparoscopic colon and rectal surgery”
JF Archives of Surgery
JO Archives of Surgery
YR 2012
FD April 1
VO 147
IS 4
SP 322
OP 323
DO 10.1001/archsurg.2011.1342
UL http://dx.doi.org/10.1001/archsurg.2011.1342
AB 
This article1 and many others suggest that the number of cases needed to achieve mastery in HALS is 105.2- 4 These studies face a number of limitations in their approach including different demographics of the study population, the age of the operating surgeon as well as his or her surgical experience, and the varying difficulty of the operations themselves.5- 6