H2OPulse: Smartphone-assisted Vein Evaluation for Early Recognition of Dehydration. - Towhidul Islam; Md. Mahedi Hasan Rigan; Md. Olid Hasan Bhuiyan; Tanzima Hashem; Md Mahbubur Rahman (Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2025)