More than 20 government schools and stadiums are among over 100 sites that will be used for Hong Kong’s universal Covid-19 testing, as some people say there has been mounting disquiet over the choice of the screening centres, some of which are located close to residential areas.Around 5,000 medical professionals have also signed up to assist with the two-week testing scheme that will begin next Tuesday, Secretary for the Civil Service Patrick Nip Tak-kuen said.But the choice of the testing…