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Hasselgren PO. The smallpox epidemics in America in the 1700s and the role of the surgeons: Lessons to be learned during the global outbreak of COVID-19.World J Surg 2020; 44:2837-2841.
Hasselgren PO. Thyroid Cancer & Thyroid Nodules in30minutes. A Guide to Symptoms, Diagnosis, Surgery, and Disease Management. i30 Media Corporation, 2020.