“Worldwide Distribution of Prekallikrein (PK) Deficiency: The Defect Seems Mainly Concentrated in West African Countries and in the United States: Worldwide Distribution of PK Deficiency:”. Mediterranean Journal of Hematology and Infectious Diseases, vol. 13, no. 1, Dec. 2020, p. e2021014, https://doi.org/10.4084/mjhid.2021.014.