Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) NITTA T,Concurrent multiple left atrial focal activations with fibrillatory conduction and right atrial focal or reentrant activation as the mechanism in atrial fibrillation,J Thorac Cardiovasc Surg,,,2003,126,,254-262,https://cir.nii.ac.jp/crid/1570009750871380096,