Al Kharusi, Zalkha, Rahma Al Kalbani, and Rahma Al-Hadhrami. “Frequency of Asthma Exacerbations and Upper Respiratory Tract Infections Among Adults With Asthma According to Vaccination Status: Does the Annual Influenza Vaccine Have a Protective Effect?”. Sultan Qaboos University Medical Journal 24, no. 1 (February 28, 2024): 70–75. Accessed May 21, 2024. https://journals.squ.edu.om/index.php/squmj/article/view/6001.