[1] Univ Calif San Francisco, Dept Surg, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Ctr Bioengn & Tissue Regenerat, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Anat, UCSF Helen Diller Comprehens Canc Ctr, Eli & Edythe Broad Ctr Regenerat Med & Stem Cell, San Francisco, CA 94143 USA
[4] Univ Calif San Francisco, Dept Bioengn & Therapeut Sci, UCSF Helen Diller Comprehens Canc Ctr, Eli & Edythe Broad Ctr Regenerat Med & Stem Cell, San Francisco, CA 94143 USA