Efficacy and safety of Suxiao Jiuxin Pill in the treatment of stable angina (Qi stagnation and blood stasis syndrome): study protocol of a randomized, double-blind, placebo-controlled, multi-center clinical trial

Coronary heart disease (CHD) has become one of the biggest health problems in the world. Stable angina is a common clinical type of CHD with poor prognosis and high mortality. Although there are various interv…