1. Pontificia Universidad Javeriana; Department of Clinical Epidemiology and Biostatistics, Faculty of Medicine; Cr. 7 #40-62, 2nd floor Bogota DC Colombia
2. Herbert Wertheim College of Medicine, Florida International University; Division of Research & Information; 11200 SW 8th Street Modesto Maidique Campus, AHC1, #443 Miami Florida USA 33178
3. CIBER Epidemiología y Salud Pública (CIBERESP); Iberoamerican Cochrane Centre, Biomedical Research Institute Sant Pau (IIB Sant Pau); Sant Antoni Maria Claret 171 - Edifici Casa de Convalescència Barcelona Catalunya Spain 08041
4. University of Vermont Medical Center; Division of Neonatal-Perinatal Medicine; 111 Colchester Avenue Burlington Vermont USA 05401