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

Hozbor DF, Arevalo-Rodriguez I, Buitrago-Garcia D, Simancas-Racines D, Zambrano-Acig P, Del Campo R, Ciapponi A, Sued O, Martinez-García L, Rutjes AW et al: Plos One 2020, 15(12).