Nitrates in combination with hydralazine in cardiorenal syndrome: a randomized controlled proof‐of‐concept study oleh Shir Lynn Lim, Mihir Gandhi, Kai Lee Woo, Horng Ruey Chua, Yoke Ching Lim, David K.L. Sim, Sheldon S.G. Lee, Yee Leong Teoh, Arthur Mark Richards, Carolyn S.P. Lam