Hooman Sadri-Ardekani1, Anthony Atala2. 1. Wake Forest Institute for Regenerative Medicine (WFIRM), Wake Forest School of Medicine, Winston-Salem, NC, USA. Electronic address: hsadri@wakehealth.edu. 2. Wake Forest Institute for Regenerative Medicine (WFIRM), Wake Forest School of Medicine, Winston-Salem, NC, USA. Electronic address: aatala@wakehealth.edu.