U-Shaped and Surface Functionalized Polymer Optical Fiber Probe for Glucose Detection. - Mikel Azkune; Leire Ruiz-Rubio; Gotzon Aldabaldetreku; Eneko Arrospide; Leyre Pérez-Álvarez; Iñaki Bikandi; Joseba Zubía; Jose Luis Vilas-Vilela (Sensors, 2018)