“…Crossclamping was predominantly performed; endoaortic balloon occlusion was performed in only 19 studies. 5,6,9,15,16,[18][19][20]26,28,29,32,33,35,36,3,42 In 16 studies, direct transthoracic crossclamping was predominantly used. 7,8,[10][11][12][21][22][23][24]30,34,40,41,45 In the rest of the studies (n ¼ 11), both modalities were used in the same proportion or it was not clearly stated which technique was mainly used.…”