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Flow chart of the study. EMR: electronic medical recording; RET: right edge of the tongue; TC: tongue center; TT: tongue tip, R: red; G: green; B: blue; L∗: luminance; a∗: red/greed balance; b∗: yellow/blue balance; CHPQ: cold-heat pattern questionnaire; R0: tongue center; R1: right side of the tongue center; R2: left side of the tongue center; R3: tip of the tongue; R4: center of the tongue root; R5: right side of the tongue root; and R6: left side of the tongue root.
