[1] Peter C. Enzinger, Robert J. Mayer. Esophageal cancer. N Engl J Med, 2003; 349, 2241−52. doi:  10.1056/NEJMra035010
[2] Lo LC , Cheng TL ,Chen YJ , et al. TCM tongue diagnosis index of early-stage breast cancer. Complement Ther Med, 2015; 23, 705−13. doi:  10.1016/j.ctim.2015.07.001
[3] Ma XX, Li YZ, Xu JT, et al. Application of information technology in tongue diagnosis in syndrome diagnosis and therapeutic evaluation. J Basic Chin Med, 2018; 035, 379−82.
[4] Lo LC, Cheng TL, Chiang JY, et al. Breast cancer Index: a perspective on tongue diagnosis in traditional Chinese medicine. J Tradit Complement Med, 2013; 3, 194−203. doi:  10.4103/2225-4110.114901
[5] Sun YY, Jiang ZHi, Dong W, et al. Image recognition of tea plant disease based on convoluntional neural network and small samples. Jiangsu J Agr Sci, 2019; 35, 48−55.
[6] Wang SH, Wang ZP, Chen DN, et al. Correlation of dark red tongue and metabolic parameters in health checkup population. Chin J Health Manage, 2016; 10, 121−5.
[7] Tong SJ, Wu J, Zhang JF, et al. Study on the relationship between the formation of tongue coating and the expressions of TGF-a and EGF-r in tumor patients. China J Tradit Chin Med Pharm, 2013; 28, 3392−5.
[8] Kawanabe T, Kamarudin ND, Ooi CY, et al. Quantification of tongue colour using machine learning in Kampo medicine. Eur J Integrative Med, 2016; 8, 932−41. doi:  10.1016/j.eujim.2016.04.002