Health Needs Assessment for Medical Genetic Services in Middle- and Low-Income Nations ARNOLD CHRISTIANSON Division of Human Genetics, National Health Laboratory Service & University of the Witwatersrand, JOHANNESBURG, South Africa. E-mail: arnold.christianson@nhls.ac.za RON ZIMMERN. Public Health Genomics Foundation, Strangeways Research Laboratory, CAMBRIDGE CB1 8RN, UK. E-mail: ron.zimmern@phgfoundation.org For the CAPABILITY Consortium