Català, Frederic
Marsà, Ferran
Montes-Usategui, Mario
Farré, Arnau
Martín-Badosa, Estela
Article History
Received: 4 October 2016
Accepted: 17 January 2017
First Online: 21 February 2017
Competing interests
: M. M.-U. and A. F. are inventors on the patents US 8,637,803 and JP 5,728,470 that protect the technology for measuring forces used in the research presented. F. M., M. M.-U. and A. F. are stockholders of the company Impetux Optics S. L., which commercially exploits said patented technology. In addition, F. M. and A. F. were employees of the company during the development of the research.