Towards a unified curriculum system based on a public health holistic approach. Renovation of the academic programs at the School of Public Health of Mexico oleh Edith Elizabeth Ferreira-Guerrero, Marcia Verónica Galván-Portillo, Angélica Ángeles-Llerenas, Arlette Bahena-Botello, Gemma Clara Llano-Tapia, Lizbeth López-Carrillo, Eduardo Lazcano-Ponce, Mario Henry Rodríguez