Corrigendum: Efficacy of a paper-based interleukin-6 test strip combined with a spectrum-based optical reader for sequential monitoring and early recognition of respiratory failure in elderly pneumonia-a pilot study - Chen, Cheng-Han; Fu, Yi-Chen; Lee, Yi-Tzu; Hsieh, Kai-Sheng; Shen, Ching-Fen; Cheng, Chao-Min (Frontiers in Pharmacology, 2023)