PT Journal AU Reimers, AK Marzi, I Schmidt, SCE Niessner, C Oriwol, D Worth, A Woll, A TI Trends in active commuting to school from 2003 to 2017 among children and adolescents from Germany: the MoMo Study SO European journal of public health PY 2020 DI 10.1093/eurpub/ckaa141 LA english ER