Study by Abraham C. Kuruvilla, MD, MD(H)    Prospective, randomized controlled trial from February–April 2001.

Study by Mannheimer, E. et. al. at Center for Integrative
Medicine, University of Maryland School of Medicine

Study by He, J. and Shen, PF. The First Affiliated Hospital of Tianjin University of Chinese Medicine, Tianjin 300193, China.

Study by Li, Y. and Peng, C.  First Affiliated Hospital, Hunan College of Traditional Chinese Medicine, Changsha, China.

Study by Lee, H., Lee, JY, Kim Y, et al.  College of Korean Medicine, Sangji University, Wonju, Korea. 

Study by Grasmüller S., and Irnich D. at the Interdisziplinäre Schmerzambulanz, Klinik für Anästhesiologie, LMU München, Germany.