Study protocol: Phase I/II trial of induced HLA-G+ regulatory T cells in patients undergoing allogeneic hematopoietic cell transplantation from an HLA-matched sibling donor oleh Memnon Lysandrou, Dionysia Kefala, Panayiota Christofi, Panayiota Christofi, Nikolaos Savvopoulos, Penelope Georgia Papayanni, Rodanthy Theodorellou, Eleftheria Sagiadinou, Vassiliki Zacharioudaki, Maria Moukouli, Dimitrios Tsokanas, Georgios Karavalakis, Maria Liga, Konstantinos Stavrinos, Anastasia Papadopoulou, Evangelia Yannaki, Alexandros Spyridonidis