Editorial : Animal Welfare - Volume II: Using Bio-sensing Devices to Assess Farm Animal Welfare - Brijs, Jeroen (University of Hawai'i at Manoa. Hawai'i Institute of Marine Biology) ; Fahlman, Andreas (Global Diving Research) ; Fore, Martin (Norwegian University of Science and Technology. Department of Engineering Cybernetics) ; Manteca Vilanova, Xavier (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)