Dried blood spot specimens for SARS-CoV-2 antibody testing: A multi-site, multi-assay comparison oleh François Cholette, Christine Mesa, Angela Harris, Hannah Ellis, Karla Cachero, Philip Lacap, Yannick Galipeau, Marc-André Langlois, Anne-Claude Gingras, Cedric P. Yansouni, Jesse Papenburg, Matthew P. Cheng, Pranesh Chakraborty, Derek R. Stein, Paul Van Caeseele, Sofia Bartlett, Mel Krajden, David Goldfarb, Allison McGeer, Carla Osiowy, Catherine Hankins, Bruce Mazer, Michael Drebot, John Kim, on behalf of the COVID-19 Immunity Task Force (CITF) working group