Corrigendum: A Paper-Based IL-6 Test Strip Coupled With a Spectrum-Based Optical Reader for Differentiating Influenza Severity in Children - Lin, Sheng-Wen; Shen, Ching-Fen; Liu, Ching-Chuan; Cheng, Chao-Min (Frontiers in Bioengineering and Biotechnology, 2021)