Double-blind acupuncture needles: a multi-needle, multi-session randomized feasibility study oleh Judith M. Schlaeger, Nobuari Takakura, Hiroyoshi Yajima, Miho Takayama, Alana D. Steffen, Elizabeth M. Gabzdyl, Robyn A. Nisi, Kathleen McGowan Gruber, Jason M. Bussell, Diana J. Wilkie