The relationship between apelin and cardiac parameters in patients on peritoneal dialysis: is there a new cardiac marker? - Karadag S; Ozturk S; Gursu M; Gurdal A; Basinoglu F; Yigit S; Aydin Z; Uzun S; Sumnu A; Oflaz H; Kazancioglu R (BMC nephrology, 2014)