Juarez, E., A. Adiga, P. Sanchez, and H. Fanasch. “Metastatic Carcinoid Tumor With Severe Double Valve Disease at Diagnosis: Case Report and Review of Literature”. The Southwest Respiratory and Critical Care Chronicles, Vol. 5, no. 21, Oct. 2017, pp. 26-31, doi:10.12746/swrccc.v5i21.416.