Ansari, Shabnam, et al. “Post-Auricular Leech Therapy Reduced Headache & Migraine Days in Chronic Migraine”. Journal of Drug Delivery and Therapeutics, vol. 9, no. 1-s, Feb. 2019, pp. 75-80, https://doi.org/10.22270/jddt.v9i1-s.2345.