Alzahrani, Alhusain J., et al. “Detection of Hepatitis C Virus and Human Immunodeficiency Virus in Expatriates in Saudi Arabia by Antigen-Antibody Combination Assays”. The Journal of Infection in Developing Countries, vol. 3, no. 03, Apr. 2009, pp. 235-8, doi:10.3855/jidc.42.