Sánchez-Payá, José, Julio Barrenengoa Sañudo, Hector Martínez, Robert Camargo Angeles, and Patricia Garcia Shimizu. 2009. “Recommendations on Respiratory Hygiene: Kit of Equipment and Information for Patients to Improve Their Compliance”. International Journal of Infection Control 6 (1). https://doi.org/10.3396/ijic.v6i1.4857.