Supplementary Material Online Current worldwide nuclear cardiology practices and radiation exposure: results from the 65 country IAEA nuclear cardiology protocols cross-sectional study (INCAPS) Supplementary Methods Potential participating laboratories were those included in lists provided by: 1) International Atomic Energy Agency, 2) American Society of Nuclear Cardiology, 3) European Council on Nuclear Cardiology, 4) Intersocietal Accreditation Commission, 5) Comissão Nacional de Energia Nuclear, and 6) Society of Nuclear Medicine-India (publicly available list). INCAPS regional coordinators for the Americas, United Kingdom, Africa, Israel, Middle East, South Asia, East Asia, and Oceania identified additional potential laboratories. In some cases, an additional email was sent by regional organizations to their respective memberships.