Edwards T, Cadigan RJ, Evans JP, Henderson GE. Biobanks containing clinical specimens: defining characteristics, policies, and practices. Clin Biochem. 2014 Mar;47(4-5):245-51. doi: 10.1016/j.clinbiochem.2013.11.023
Glass RL, Rothman KJ, Espinal F, Velez H, Smith NJ. Prevalence of human dental caries and water-borne trace metals. Arch Oral Biol. 1973 Sep;18(9):1099-104. doi: 10.1016/0003-9969(73)90083-6