https://www.adnkronos.com/fatti/esteri/2020/04/16/coronavirus-usa-indagano-ipotesi-origine-laboratorio_fnygBu7nnPycDH9OMpWuzI.html
http://www.rainews.it/dl/rainews/articoli/usa-cnn-intelligence-indaga-su-laboratori-per-provenienza-virus-60fb5daa-141a-4040-b631-5652da55b6da.html
