Cook, D., Johnstone, J., Marshall, J., Lauzier, F., Thabane, L., Mehta, S., Dodek, P., McIntyre, L., Pagliarello, J., Henderson, W., Taylor, R., Cartin-Ceba, R., Golan, E., Herridge, M., Wood, G., Ovakim, D., Karachi, T., Surette, M., Bowdish, D., Lamarche, D., Verschoor, C., Duan, E., Heels-Ansdell, D., Arabi, Y., & Meade, M. (2016). probiotics: Prevention of Severe Pneumonia and Endotracheal Colonization Trial—PROSPECT: a pilot trial. Trials, 17(1), 1–10. http://access.bl.uk/ark:/81055/vdc_100080521596.0x00002a