Direct and Label-Free Determination of Human Glycated Hemoglobin Levels Using Bacteriorhodopsin as the Biosensor Transducer. - Lin, Ying-Chin; Lin, Ching-Yu; Chen, Hsiu-Mei; Kuo, Li-Pin; Hsieh, Cheng-En; Wang, Xiang-He; Cheng, Chih-Wen; Wu, Chih-Yin; Chen, Yi-Su (Sensors (14248220), 2020)