1 Department of General Surgery, Arrowhead Regional Medical Center, Colton, CA, USA; Department of General Surgery, Kaiser Permanente (Fontana) Medical Center, Fontana, CA, USA. Electronic address: [email protected].
2 Western University of Health Sciences, College of Osteopathic Medicine of the Pacific, Pomona, CA, USA.
3 Department of General Surgery, Arrowhead Regional Medical Center, Colton, CA, USA; Department of General Surgery, Kaiser Permanente (Fontana) Medical Center, Fontana, CA, USA.
4 Department of General Surgery, Kaiser Permanente (Fontana) Medical Center, Fontana, CA, USA.