Sijunzi decoction on prevention and treatment of recurrence of colorectal adenoma after resection: a multicenter, randomized controlled trial

Interventions: Sijunzi Decotion Group:Sijunzi Decoction formula granules are taken orally, one tablet at a time, twice a day. The course of treatment is 12 months.;Placebo Group:Placebo granules are taken orally, one tablet at a time, twice a day. The course of treatment is 12 months. Primary outcome(s): The recurrence rate of colorectal adenoma Study Design: Parallel