Endoscopic retrograde appendicitis therapy for acute appendicitis: a systematic review and meta-analysis oleh Banreet Dhindsa, Yassin Naga, Alexander Praus, Syed Mohsin Saghir, Harmeet Mashiana, Daryl Ramai, Saurabh Chandan, Harlan Sayles, Amaninder Dhaliwal, Ishfaq Bhat, Shailender Singh, Douglas Adler