What explains public transport use? Evidence from seven European cities - Gascon, M; Marquet, O; Gràcia-Lavedan, E; Ambròs, A; Götschi, T; Nazelle, AD; Panis, LI; Gerike, R; Brand, C; Dons, E; Eriksson, U; Iacorossi, F; et al. (Transport Policy, 2020)