Influenza vaccination to improve outcomes for patients with acute heart failure (PANDA II): a multiregional, seasonal, hospital-based, cluster-randomised, controlled trial in China.

流感疫苗接種以改善急性心臟衰竭患者預後（PANDA II）：中國多區域、季節性、以醫院為基礎的叢集隨機對照試驗