Lennon RP, Griffin C, Miller EL, Dong H, Rabago D, Zgierska AE. Norovirus infections drop 49% in the United States with strict COVID-19 public health interventions. Acta Med Acad. 2020 Dec;49(3):278-80. doi: 0.5644/ama2006-124.317
Rothman KJ, Glass RL, Espinal F, Velez H. Caries-free teeth in the absence of fluoride ion. J Public Health Dent. 1972;32(4):225-8. doi: 10.1111/j.1752-7325.1972.tb03977.x