The clinical value of circadian biofeedback in chronic heart failure. - van Es VAA; De Lathauwer ILJ; van Blerck FJC; van Leunen MMCJ; van de Sande DAJP; Brouwers RWM; Funk M; Ricciardi E; Handjaras G; Betta M; Kemps HMC (European heart journal. Digital health, 2026)