[1] Omran Gen Hosp, Dept Med, Al Hasa, Saudi Arabia
[2] King Khalid Univ, Fac Med, Abha, Saudi Arabia
[3] King Abdulaziz Univ, Fac Med, Jeddah, Saudi Arabia
[4] Warsaw Med Univ, Fac Med, Warsaw, Poland
[5] Gurayat Gen Hosp, Dept Intens Care, Gurayat, Saudi Arabia
[6] Secur Forces Hosp, Dept Internal Med, Dammam, Saudi Arabia