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Dieltiens continued his studies at the Chapelle musicale Reine Élisabeth in Waterloo, Belgium. He also studied with André Messens in Antwerp, Belgium, with André Navarra in Detmold, Germany and with Pierre Fournier in Geneva, Switzerland. He received a diploma from the Akademie für Solisten in Wolfenbüttel, Germany and a Diploma d'Onore from the Accademia Chigiana in Siena, Italy.