Unrecognized secondary causes of hypertension in patients with hypertensive urgency/emergency: prevalence and co-prevalence - Borgel, J; Springer, S; Ghafoor, J; Arndt, D; Duchna, H W; Barthel, A; Werner, S; Van Helden, J; Hanefeld, C; Neubauer, H; Bulut, D; Mugge, A (Clin Res Cardiol, 2010)