1. Introduction On 31 December 2019, the World Health Organization (WHO) recognized cases of ‘viral pneumonia’ in Wuhan, China, which was later identified as SARS-CoV-2 [1]. By 11 March 2020, the WHO had declared COVID-19 a global pandemic. As of 30 May 2020, over 5.5 million cases had been registered with over 350,000 deaths [2]. To date, there have been over 760 million cases of SARS-CoV-2 confirmed globally and more than 6.9 million COVID-19-associated deaths recorded [3].