Frei, P, M Imboden, A Gemperli, P Schmid-Grendemeier, and AJ Bircher. “Sensitisation to Ambrosia in Switzerland: A Public Health Threat on the Wait”. Swiss Medical Weekly 139, no. 0506 (February 7, 2009): 70–70. Accessed April 17, 2024. https://smw.ch/index.php/smw/article/view/945.