The transformation of quantitative variables into categories is a common practice in both experimental and observational studies. The typical procedure is to create groups by splitting the original variable distributi...
This work was supported by the Climbing Program of Chinese Committee of Sciences and State Administration of Traditional Chinese Medicine.
It has been demonstrated that an important clinical phenomenon often associated with visceral diseases is the referred pain to somatic structures, especially to the body areaof homo-segmental innervation. It is intere...