1. Faculty of Dentistry; University of Chile; Santiago Chile
2. Faculty of Dentistry; University Complutense; Madrid Spain
3. Professor of Orthodontics and Faculty Member; School of Dentistry; University of Antioquia; Medellin Colombia
4. Iberoamerican Cochrane Center, Iberoamerican Cochrane Center; Sant Pau Biomedical Research Institute (IIB Sant Pau) and CIBER Epidemiología y Salud Pública (CIBERESP); Barcelona Spain