The Influences of NO and Ach on cGMP Levels in Two Patient Populations Zhen Jiang, Ye Lei, Kefang Gu, Jin Xianghua, Xia Liming and Hu Kejian J Extra Corpor Technol, 33 1 (2001) 23-26 Published online: 14 August 2023 DOI: 10.1051/ject/200133123