Nitiyanant, Prawat, Vitoon Pitiguagool, Chirotchana Suchato, and Rergchai Varatorn. “Diffuse Pulmonary Neuroendocrine Cell Hyperplasia With Tumorlets and Elevated Serum CEA”. The Bangkok Medical Journal 1, no. 1 (February 18, 2018): 21. Accessed August 14, 2020. https://he02.tci-thaijo.org/index.php/bkkmedj/article/view/217635.