1. Senior Research Associate, Health Care Products Project, The Pew Charitable Trusts, 901 E Street NW, Washington, DC 20004, USA
2. Professor, Department of Health, Society & Behavior; Program in Public Health, Member, Stem Cell Research Center, University of California, Irvine, Anteater Instruction & Research Offices, 2nd Floor, 653 E. Peltason Dr., Irvine, CA 92697-3957, USA
3. Director, Health Care Products Project, The Pew Charitable Trusts, 901 E Street NW, Washington, DC 20004, USA