Oldroyd, K. G., Rae, A. P., Carter, R., Wingate, C., & Cobbe, S. M. (1991). Double blind crossover comparison of the effects of dual chamber pacing (DDD) and ventricular rate adaptive (VVIR) pacing on neuroendocrine variables, exercise performance, and symptoms in complete heart block.

Oldroyd, K G., A P. Rae, R. Carter, C. Wingate, and S M. Cobbe. Double Blind Crossover Comparison of the Effects of Dual Chamber Pacing (DDD) and Ventricular Rate Adaptive (VVIR) Pacing On Neuroendocrine Variables, Exercise Performance, and Symptoms in Complete Heart Block. 1991.

Oldroyd, K G., et al. Double Blind Crossover Comparison of the Effects of Dual Chamber Pacing (DDD) and Ventricular Rate Adaptive (VVIR) Pacing On Neuroendocrine Variables, Exercise Performance, and Symptoms in Complete Heart Block. 1991.