Hussain, Zain, Ng, Dominic Mark, Alnafisee, Nouf, Sheikh, Zakariya, Ng, Nathan, Khan, Ateeb, Hussain, Amir, Aitken, Debbie, Sheikh, Aziz, "Effectiveness of virtual and augmented reality for improving knowledge and skills in medical students: protocol for a systematic review", BMJ Open, 2021