Lifestyle intervention in children with obesity and nonalcoholic fatty liver disease (NAFLD): study protocol for a randomized controlled trial in Ningbo city (the SCIENT study) oleh Ping-ping Zhang, You-xin Wang, Fang-jing Shen, Yun-fei Xing, Jia-ying Gu, Xue-ying Li, Han Jin, Shi-feng Jin, Miao Xu, Hai-jun Wang, Hui Wang, Li Li