When observational studies are as helpful as randomized trials: Examples from orthopedic trauma. Issue 3 (September 2019) - Beks, Reinier B.; Bhashyam, Abhiram R.; Houwert, Roderick Marijn; van der Velde, Detlef; van Heijl, Mark; Smeeing, Diederik P.J.; Hietbrink, Falco; Leenen, Luke P.H.; Groenwold, Rolf H.H.