TrimetaziDine as a Performance-enhancING drug in heart failure with preserved ejection fraction (DoPING-HFpEF): rationale and design of a placebo-controlled cross-over intervention study - A. A. van de Bovenkamp; A. J. Bakermans; C. P. Allaart; A. J. Nederveen; W. E. M. Kok; A. C. van Rossum; M. L. Handoko (Netherlands Heart Journal, 2020)