False-negative results of initial RT-PCR assays for COVID-19: A systematic review.

I. Arevalo-Rodriguez,D. Buitrago-Garcia,D. Simancas-Racines,P. Zambrano-Achig,R. Del Campo,A. Ciapponi,O. Sued,L. Martinez-García,A. W. Rutjes,N. Low,P. M. Bossuyt,J. A. Perez-Molina and J. Zamora. False-negative results of initial RT-PCR assays for COVID-19: A systematic review. PLoS One. 2020;15(12):10.1371/journal.pone.0242958.