1. a Department of Polymer Engineering , University of Minho , Campus de Azurém, Guimarães, Portugal
2. b Department of Polymer Engineering , University of Minho , Campus de Azurém, 4800-058, Guimarães, Portugal
3. c 3B's Research Group-Biomaterials, Biodegradables, and Biomimetics , University of Minho , Campus de Gualtar, 4710-057, Braga, Portugal