Low molecular weight heparin and 28-day mortality among patients with coronavirus disease 2019: A cohort study in the early epidemic era
                            
                                                                                                        W. Qin,
                                                                                                        F. Dong,
                                                                                                        Z. Zhang,
                                                                                                        B. Hu,
                                                                                                        S. Chen,
                                                                                                        Z. Zhu,
                                                                                                        F. Li,
                                                                                                        X. Wang,
                                                                                                        Y. Zhang,
                                                                                                        Y. Wang,
                                                                                                        K. Zhen,
                                                                                                        J. Wang,
                                                                                                        I. Elalamy,
                                                                                                        C. Li,
                                                                                                        Z. Zhai,
                                                                                                        B. Davidson,
                                                                                                        C. Wang,
                                                            
                            
                                2021