Reporting ethical approval in case reports and case series in 12 consecutive years: A systematic review by Linh Tran, Vuong Thanh Huan, Luu Lam Thang Tai, Adnan Safi, Moustafa ElBadry Ahmed, Mohamed Osman Algazar, Sedighe Karimzadeh, Nguyen Vinh Khang, Nguyen Hai Nam, Zaheer Ahmad Qureshi, Nguyen Lam Vuong, Le Huu Nhat Minh, Nguyen Tien Huy

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