Authors’ contributions
The authors have no competing interests to report. Drs Ceballos Osorio, Young, Bahamonde, and Feld devised the project, the study design and the main conceptual ideas. Dr. Ceballos initiated funding from Children’s Miracle Network. Dr. Bahamonde and Pablo Boada worked on the training, organization and supervision of the study in country. Dr. Ceballos and Dr. Feld met with the research team throughout the process, designed the data collection tools and supervised data management. Dr. Rayens performed the analysis, aided in interpreting the results, and worked on the methods, tables and results of the manuscript. Dr. Feld led writing of the manuscript, Dr. Ceballos was the next most involved in the writing, but all authors contributed, were engaged, discussed results, edited, commented, and agreed to publication of the manuscript.