First deadline date: Before May 31, 2024 To register, please click on the selected amount. Inscription high and upper middle income country Inscription lower middle income country Inscription low income countries Payment IOPTMH Members USD 250 USD 220 USD 200 Payment IOPTMH Non-Members and other professionals USD 400 USD 370 USD 350 Payment Undergraduate students USD 80 USD 70 USD 50