Much of the world responded to the Covid-19 pandemic with a lockdown strategy. Now there's much focus on finding a sustainable post-lockdown strategy that doesn\u2019t prompt a second wave of infection. Could Sweden be the model? HARDtalk\u2019s Stephen Sackur speaks to Sweden\u2019s chief epidemiologist Anders Tegnell, the architect of a controversial no-lockdown strategy that continues to stir interest across the world. Has it worked?