Of these, 487 were clinical trials (356 RCT and 131 non-RCT), 80 were pre-
clinical experimental
studies, and 76 were summaries of non-randomized clinical experience.
Out of these studies, the researchers identified 53 RCTs that reported random allocation of patients with chronic hepatitis B to treatment with TCM formulations; these trials met the inclusion criteria and were used in the meta-analysis.