1 Department of Kinesiology and Health Education, College of Education, The University of Texas at Austin, Austin, TX,USA.
2 People Health & Place Unit, Prevention Research Center in St. Louis, Brown School, Washington University in St. Louis, St. Louis, MO,USA.
3 School of Medicine, Universidad de los Andes, Bogotá,Colombia.
4 Department of Physical Activity and Healthy Lifestyles, Center for Nutrition and Health Research, Instituto Nacional de Salud Pública, Cuernavaca,Mexico.