Dynamics of hydration water in gelatin and hyaluronic acid hydrogels Sotiria Kripotou, Konstantinos Zafeiris, Maria Culebras-Martínez, Gloria Gallego Ferrer and Apostolos Kyritsis Eur. Phys. J. E, 42 8 (2019) 109 Published online: 27 August 2019 DOI: 10.1140/epje/i2019-11871-2