Peihong Li, et al. “Role of Immunohistochemical Markers Chromogranin A and Synaptophysin: A Retrospective Analysis for the Outcome of Patients With Pulmonary Carcinoid Tumors”. Diagnostic and Treatment Advances in COVID-19 and SARS-CoV-2, Feb. 2023, pp. 257-66, doi:10.9734/bpi/mono/978-81-19039-63-0/CH22.