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Langley, T. and Geiger, W. and Gartlehner, G. (2008): Aromatherapy for pain relief and psychological problems. Systematic review. Decision Support Document 16.
Langley, T. and Geiger, W. and Gartlehner, G. (2008): Bach Flower Remedies for pain relief and psychological problems. Systematic review. Decision Support Document 17.