Llanos-Torres, Kevin H., et al. “Nosocomial Infections in Emergency Observation Units and Their Association With Overcrowding and Ventilation”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 37, no. 4, Oct. 2020, pp. 721-5, https://doi.org/10.17843/rpmesp.2020.374.5192.