Research Council for Complementary Medicine (University of Westminster, London, UK) for giving relevant studies to be included.
Personal contact lists:
Addy Hackett about effectiveness of mindful meditation as a group therapy for anxiety disorder.
Catherine L. Hoover, Jeffrey Hoover : The Summit Lighthouse.
Carol Thompson , Tom Beckman from The Institute of HeartMath.
Chueh‐Fen Lu sent original article of Zen Meditation for treatment of Anxiety Disorder.
David Shannahoff‐Khalsa sent original article to be included.
Edwards Smith, MD President, Maharishi College of Vedic Medicine.
Graham Kirkwood provided potential relevant studies.
Kevin Cheng at The Institute of Qigong sent many references of Qi‐gong for anxiety.
Lars Rasmussen MD sent some references about Transcendental Meditation.
Majorie Raskin for further details of included study.
Michael Mayer, Ph.D. is a Qigong teacher gave some references.
Mood and Anxiety Disorders Program of Emory University School of Medicine.
Patricia L. Gerbarg, MD Richard P. Brown, MD Su Bowerman from organization of Sudarshan Kriya.
Peter H Canter MD had sent some references of his work.
Vladimir Antonov, Ph.D. (in Biology), Russia at The Religious Book For God Seekers.

List of contacted organizations:
Association for the Advancement of Psychosynthesis Meditation Groups, Inc.
Brahma Kumaris World Spiritual University
Holistic Online.com
Institute of HeartMath
Scandinavian Yoga and Meditation School
Sri Ram Chandra Mission
The Art of Living Foundation
Transcendental Meditation organization and sub‐organization
Vipassana Research Institute