1. Nursing School, Universidad de Las Américas, Concepción, Chile
2. Faculty of Nursing, Universidad de Concepción, Concepción, Chile
3. Department of Statistics, Universidad de Concepción, Concepción, Chile
4. ANID - Millennium Science Initiative Program - Millennium Nucleus Center for the Discovery of Structures in Complex Data, Santiago, Chile
5. Nursing School, Universidad de Las Américas, Santiago, Chile