http://www.humantruth.info/tags/meditation.html
Human Truth Foundation pages (9):
Meditation, in the following sections:
Psychosomosis - the Placebo and Nocebo Effects: Curing and Causing Disease with the Mind, in the following sections:
Zen Buddhism: 2. Meditation
How Does Karma Work in Hinduism, Buddhism and Jainism?: 5. Sikhism
Theosophy: 1. Practices and Beliefs
Faith Healing: Delusion, Child Abuse and Theological Concerns: 1.3. Psychosomosis
Not from the Human Truth Foundation, but still relevant (1):