Differential effects of sound interventions tuned to 432 Hz or 443 Hz on cardiovascular parameters in cancer patients: a randomized cross-over trial. - Hohneck A; Rodríguez ÁM; Weingärtner S; Merx K; Sarodnick F; von Gagern F; Mavratzas A; Burkholder I; Schumacher G; Hofmann WK; Hofheinz RD (BMC complementary medicine and therapies, 2025)