Thomas P Stossel, MD, American Cancer Society Professor of Medicine, Harvard Medical School, Director, Translational Medicine Division, Brigham & Women's Hospital, 1 Blackfan Circle, Boston, MA 02115, USA. Tel: 617 355 9001 (Tstossel@partners.org).

H Franklin Bunn, MD, Professor of Medicine, Harvard Medical School, Senior Physician, Hematology Division, Brigham & Women's Hospital, 1 Blackfan Circle,, Boston, MA 02115 USA (HBUNN@PARTNERS.ORG).

Maureen Okam, MD, Instructor in Medicine, Harvard Medical School, Physician, Hematology Division, Brigham & Women's Hospital, 10 Francis Street, Boston, MA 02115 USA (MOkam@partners.org).

Tendai M'Soka, MD, PhD, Professor of Pediatrics, University of Zambia School of Medicine, Head, Division of Hematology & Oncology, Department of Pediatrics, University Teaching Hospital, PO Box 50110, Lusaka, Zambia (Tmsoka@zamnet.am).

Chifumbe Chintu, MD, FRCP, Professor of Pediatrics and Dean Emeritus, University of Zambia School of Medicine, Senior Physician, Department of Pediatrics, University Teaching Hospital, PO Box 50110, Lusaka, Zambia (cchintu@zamnet.zm).

Cynthia K Changufu, Executive Director or Agatha Chintu Zulu, Administrative Manager, Foundation for People Living with Sickle Cel Anaemia, PO Box 35711, Lusaka, Zambia. Tel ꣼ 1 256688 (sicklecell@zamnet.zm).