Prediction of response to cardiac resynchronization therapy using electrocardiographic criteria: A systematic review Paulo Dias Costa; João Pedro Bessa; Mariana Canelas Pais; Daniela Ferreira-Santos; Fernando Montenegro Sá; Matilde Monteiro-Soares; António Hipólito-Reis; Mário Martins Oliveira; Pedro Pereira Rodrigues;

Effect of vitamin D supplements on left ventricular ejection fraction in patients with heart failure: A systematic review and meta-analysis of randomized controlled trials Aryan Naghedi; Hasan Haghaninejad; Hamidreza Varastehravan; Arvin Naghedi; Nima Farshadi;