Recruiting Hard-to-Reach Subjects for Exercise Interventions: A Multi-Centre and Multi-Stage Approach Targeting General Practitioners and Their Community-Dwelling and Mobility-Limi...

Brach, Michael, Moschny, Anna, Bücker, Bettina, Klaaßen-Mielke, Renate, Trampisch, Matthias, Wilm, Stefan, Platen, Petra, Hinrichs, Timo
2013