COVID-19 surveillance data quality issues: a national consecutive case series
Cristina Costa-Santos, Ana Luisa Neves, Ricardo Correia, Paulo Santos, Matilde Monteiro-Soares, Alberto Freitas, Ines Ribeiro-Vaz, Teresa S Henriques, Pedro Pereira Rodrigues, Altamiro Costa-Pereira, Ana Margarida Pereira, Joao A Fonseca
BMJ Open Dec 2021, 11 (12) e047623; DOI: 10.1136/bmjopen-2020-047623