1. Director, Health Care Products Project, The Pew Charitable Trusts, 901 E Street, NW, Washington, DC 20004-2008, USA
2. Senior Research Associate, Health Care Products Project, The Pew Charitable Trusts, 901 E Street, NW, Washington, DC 20004-2008, USA
3. Associate Professor, Biomedical Ethics Research Program & Center for Regenerative Medicine, Mayo Clinic, 200 First Street, SW, Rochester, MN 55905, USA