Cluster-randomised trial on participatory community-based outdoor physical activity promotion programs in adults aged 65-75 years in Germany: protocol of the OUTDOOR ACTIVE intervention trial.
Karin BammannCarina DrellLena Lotte LübsImke StallingPublished in: BMC public health (2018)
German Clinical Trials Register DRKS00015117 (Date of registration 17-07-2018).