Tkatch R, Bazarko D, Musich S, Wu L, MacLeod S, Keown K, Hawkins K, Wicker E. A pilot online mindfulness intervention to decrease caregiver burden and improve psychological well-being. J Evid Based Complementary Altern Med. 2017 Oct;22(4):736-43. doi: 10.1177/2156587217737204
Rothman KJ, Velez H, Glass RL, Mejia R, Espinal F. Dental caries and soil contents of trace metals in two Colombian villages. J Dent Res. 1972 Nov 1;51(6):1686.