Introduction Analysis of data derived from homeopathic pathogenetic trials (HPTs, homeopathic drug provings) has been a challenge. Most parts of the homeopathic pharmacopeia were sourced from Hahnemann's Materia Medica Pura (1825-1833), IF Allen's Encyclopedia (1874) and Constantine Hering's Materia Medica (1879-1891), well before randomised controlled trials were in use. As a result, such studies and their outcomes harbour a large risk of inclusion of unreliable symptoms.
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