Mordin M, Parrish W, Masaquel C, Bisson B, Copley-Merriman K. Intra-articular hyaluronic acid for osteoarthritis of the knee in the United States: a systematic review of economic evaluations. Clin Med Insights Arthritis Musculoskelet Disord. 2021 Nov 19;14:1-13. doi: 10.1177/11795441211047284
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