1. Medicine Faculty, National University of Colombia, Bogot� 111321, Colombia
2. School of Biochemistry, Medicine and Science Faculty, San Sebasti�n University, Santiago 7510157, Chile
3. Statistics Department, National University of Colombia, Bogot� 111321, Colombia
4. Instituto de Gen�tica Humana, Facultad de Medicina, Pontificia Universidad Javeriana, Bogot� 110231, Colombia