Lessons in cognitive unloading, skills mixing, flattened hierarchy and organisational agility from the Nightingale Hospital London during the first wave of the SARS-CoV-2 pandemic - Ben O'Brien; Richard Schilling; Andrew Wragg; Alastair Proudfoot; Nikhil Ahluwalia; Mark Westwood; Charles Knight; George Benjamin Collins; Lynne Arrol; Natalie Forrest; Alan McGlennan; Matthew Trainer; et al. (BMJ Open Quality)