14.Vahedi K, Domigo V, Amarenco P, Bousser MG. Ischaemic stroke in a sportsman who consumed MaHuang extract and creatine monohydrate for body building. J Neurol Neurosurg Psychiatry. 2000 Jan;68(1):112-3. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1760579/pdf/v068p00112.pdf
15.Massey, L.K., Sutton, R.A. Acute caffeine effects on urine composition and calcium kidney stone risk in calcium stone formers. Journal of Urology. 2004 Aug;172(2):555-8. http://www.ncbi.nlm.nih.gov/pubmed/15247728
16.James JE. Critical review of dietary caffeine and blood pressure: a relationship that should be taken more seriously. Psychosom Med 2004; 66 (1): 63-71. http://www.ncbi.nlm.nih.gov/pubmed/14747639