What are the factors for detecting adverse events in second‐look endoscopy after per‐oral endoscopic myotomy (POEM)? A reply to "Second‐look endoscopy after POEM for all, some or none… More you see, the more you find!". Issue 3 (5th November 2020) - Fujiyoshi, Yusuke; Onimaru, Manabu; Inoue, Haruhiro