Human capital on the move: Education as a determinant of internal migration in selected INDEPTH surveillance populations in Africa Mark Otiende, Frank Odhiambo, Karim Derra, Orvalho Augusto, Sulaimon Afolabi, Philippe Bocquier, Carren Ginsburg, Abdramane B. Soura, Pascal Zabre, Mark Collinson, Donatien Beguy, M. White