Endometrial scratching during hysteroscopy in women undergoing in vitro fertilization: a systematic review and meta-analysis oleh Evangelos Papanikolaou, Nikolaos Peitsidis, Nikolaos Peitsidis, Ioannis Tsakiridis, Georgios Michos, Antonios Skalias, Dimitrios Patoulias, Alexandros Poutoglidis, Apostolos Mamopoulos, Apostolos Athanasiadis, Grigorios Grimpizis, Robert Najdecki