Westermark , P., G. T. Westermark, O. B. Suhr, and S. Berg. “Transthyretin-Derived Amyloidosis: Probably a Common Cause of Lumbar Spinal Stenosis”. Upsala Journal of Medical Sciences, vol. 119, no. 3, Mar. 2014, pp. 223–228, doi:10.3109/03009734.2014.895786.