Clinical Value of NT-proBNP and Performance Myocardial Index as an Echocardiographic Predictor of Early Cardiac Involvement in Patients with Carcinoid Syndrome. acbr [Internet]. 2022 Sep. 19 [cited 2026 Sep. 17];6(5):732-9. Available from: https://fortunejournals.org/ojs/index.php/acbr/article/view/14951