Haptic Tasks for Physical Laparoscopic ("Box") Trainers to Differentiate Surgeon Skill. - Ravikiran B. Singapogu; Dane E. Smith; Bliss M. Altenhoff; Lindsay O. Long; Ryan Bontreger; Christopher C. Pagano; Timothy C. Burg; Karen J. K. L. Burg (MMVR, 2012)