Published scientific research by Psychologist Elizabeth Carter (Counselling, Psychotherapy, and Health Journal, 2(2), 27-39, July 2006), found that amongst many other benefits, SelfDevelopment.biz Cds increase general feelings of well-being, positive thoughts & improve coping ability in stressful situations, while decreasing incidence of insomnia, feelings of anger & negative thinking.
Please follow this link to view the research:
http://www.cphjournal.com/archive_journals/V2_I2_Carter_27-39_07_06.pdf
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