Macroepidemiological aspects of porcine reproductive and respiratory syndrome virus detection by major United States veterinary diagnostic laboratories over time, age group, and sp... oleh Giovani Trevisan, Leticia C M Linhares, Bret Crim, Poonam Dubey, Kent J Schwartz, Eric R Burrough, Rodger G Main, Paul Sundberg, Mary Thurn, Paulo T F Lages, Cesar A Corzo, Jerry Torrison, Jamie Henningson, Eric Herrman, Gregg A Hanzlicek, Ram Raghavan, Douglas Marthaler, Jon Greseth, Travis Clement, Jane Christopher-Hennings, Daniel C L Linhares