Appraises and critiques the sampling method used by the researcher " Patients & methods: We searched PubMed and Embase for randomized controlled trials that examined the impact of HBI in HF. A random-effects meta-analysis was performed using R. Result: Total 17/409 articles (3214 patients) met our inclusion criteria. The pooled estimate showed HBI was associated with a reduction in readmission rates and mortality (22 and 16% respectively; p < 0.05). Subgroup analysis confirmed that the benefit o