Correction: Quantifying Online News Media Coverage of the COVID-19 Pandemic: Text Mining Study and Resource - Konrad Krawczyk; Tadeusz Chelkowski; Daniel J Laydon; Swapnil Mishra; Denise Xifara; Benjamin Gibert; Seth Flaxman; Thomas Mellan; Veit Schwämmle; Richard Röttger; Johannes T Hadsund; Samir Bhatt (JMIR Publications, 2021)