Djer, Mulyadi, and Bambang Madiyono. 2009. “Blood Nickel Level and Its Toxic Effect After Transcatheter Closure of Persistent Duct Arteriosus Using Amplatzer Duct Occluder”. Paediatrica Indonesiana 49 (1), 33-8. https://doi.org/10.14238/pi49.1.2009.33-8.