Now, for a period of three years, I gathered data, not just me but also some of my friends, and I used to teach in university, so I forced my -- I mean, I asked my students to do this as well.
Durant tres anys, he recollit dades, no només jo, sinó també alguns amics meus, i donava classes a la universitat,  així que obligava els meus... vull dir, demanava als meus estudiants que també ho fessin.