Personalized Threshold-Based HRV Stress Detection from PPG Data: Preliminary Evaluation with a Biofeedback Serious Game. - Stylianos M. Papelis; Nikolaos Bothos-Vouterakos; Konstantinos Mitsis; Aikaterini Fragkou; Glykeria Theodorou; Eleftherios Kalafatis; Theofanis Ganitidis; Konstantina S. Nikita (BIBE, 2025)