Corrigendum to "Stress concentration affecting hydrogen-assisted crack in API X70 pipeline base and weld steel under hydrogen/natural gas mixture" [Eng. Fail. Anal. 122 (2021) 105242]. (November 2021) - Nguyen, Thanh Tuan; Heo, Hyeong Min; Park, Jaeyeong; Nahm, Seung Hoon; Baek, Un Bong