Genetic population structure of two African-Ecuadorian communities of Esmeraldas M.S. Mesa Santurino, A.E.B. Guevara, C. Varas De Vieira, J.A. Pe�a, R.M. Corbo, R. Scacchi, Christina Mart�nez-Labarga, Olga Rickards, Gianfranco Biondi, Gian Franco De Stefano • 1999