Ben-Shlomo, Y., Churchyard, A., Head, J., Hurwitz, B., Overstall, P., Ockelford, J., & Lees, A. J. (1998). Investigation by Parkinson’s Disease Research Group of United Kingdom into excess mortality seen with combined levodopa and selegiline treatment in patients with early, mild Parkinson’s disease: Further results of randomised trial and confidential inquiry. British Medical Journal.

Ben-Shlomo, Y., A. Churchyard, J. Head, B. Hurwitz, P. Overstall, J. Ockelford, und A J. Lees. Investigation By Parkinson’s Disease Research Group of United Kingdom Into Excess Mortality Seen With Combined Levodopa and Selegiline Treatment in Patients With Early, Mild Parkinson’s Disease: Further Results of Randomised Trial and Confidential Inquiry. British Medical Journal, 1998.

Ben-Shlomo, Y., et al. Investigation By Parkinson’s Disease Research Group of United Kingdom Into Excess Mortality Seen With Combined Levodopa and Selegiline Treatment in Patients With Early, Mild Parkinson’s Disease: Further Results of Randomised Trial and Confidential Inquiry. British Medical Journal, 1998.