Detection of neutralizing antibodies against multiple SARS-CoV-2 strains in dried blood spots using cell-free PCR oleh Kenneth Danh, Donna Grace Karp, Malvika Singhal, Akshaya Tankasala, David Gebhart, Felipe de Jesus Cortez, Devangkumar Tandel, Peter V. Robinson, David Seftel, Mars Stone, Graham Simmons, Anil Bagri, Martin A. Schreiber, Andreas Buser, Andreas Holbro, Manuel Battegay, Mary Kate Morris, Carl Hanson, John R. Mills, Dane Granger, Elitza S. Theel, James R. Stubbs, Laurence M. Corash, Cheng-ting Tsai