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Safe needling depth at BL40

I enjoyed reading the recent article by Hou et al.1 in Acupuncture in Medicine; in this article, the authors investigated safe needling depths at traditional acupuncture point BL40 on the magnetic resonance imaging (MRI) transverse images of 124 participants and reported the distance between BL40 at the top of skin and popliteal artery underneath. I would like to respectfully express my opinions, as follows.