1. Unit of Basic Oral Investigation, School of Dentistry, El Bosque University, Bogotá, Colombia.
2. Division of Periodontics, School of Dentistry, El Bosque University.
3. MSc Dentistry Program, School of Dentistry, Ibirapuera University, São Paulo, Brazil.
4. Department of Periodontics, College of Dentistry, The University of Iowa, Iowa City, IA.