Van Hees, V.(2014). Audio prompts and demonstration video for the activity classification study [Video file]. https://www.repository.cam.ac.uk/handle/1810/245357
Audio Prompts and Protocol Instruction video for the Physical Activity Annotation Study as referenced in Van Hees V. et. al. "Impact of study design on development and evaluation of an activity-type, classifier". Journal of Applied Physiology. 114: 1042-1051, 2013.