Letter to the Editor
                                    Diagnostic accuracy of Doppler ultrasonography for assessment of internal thoracic artery graft patency
                                    
                                    
                                                                                                                                    1Sanitation 1 Medical Academic Center, Bangkhae, Bangkok-Thailand
2Hainan Medical University, China; University of Nis, Serbia; Joseph Ayobabalola University-Nigeria
                                                                                                                        
                                    
                                2Hainan Medical University, China; University of Nis, Serbia; Joseph Ayobabalola University-Nigeria