“Is there a doctor on board?”: willingness and confidence of physicians in the Kingdom of Saudi Arabia in assisting with in-flight medical emergencies oleh Nouf A. AlShamlan, Reem S. AlOmar, Majd Mohammed Alrayes, Saud K. Alkhaldi, Ali Hamad Alomar, Abdulrahman Abdulaziz Alghamdi, Fares Mohammad Nassef, Sarah Hussain Al-Matar, Hatem A. Alqahtani