a Maya Vision production in association with the BBC and PBS ; written and presented by Michael Wood ; directed by David Wallace ; produced by Rebecca Dobbs
National Geographic ; produced by Darlow Smithson Productions in association with Channel 4 and France 5 for National Geographic Channel ; producer/director, Yavar Abbas
a NOVA production by Erikson & Nilsson Production in association with WGBH/Boston ... [and others] ; medical photography, Lennart Nilsson ; produced, written by Julia Cort