1Pathophysiological factors and solutions for difficult/delayed withdrawal of mechanical ventilationLIU Gang, LIU Shuang-lin, WANG Mei-ju329-3322Comorbidity of chronic obstructive pulmonary disease—cognitive impairmentCHANG Xiao-dan, HUANG Dan-hui, CAI Shao-xi333-3393Guiding value of risk stratification for management strategy of pulmonary embolismLI De-zhi, ZHU Ling340-3444Application of lung biopsy in diagnosis of idiopathic pulmonary fibrosisHAN Qian, LUO Qun345-3495Parameters setting of high-flow nasal cannula oxygen therapy for acute respiratory failureQIN Zhi-qiang350-3556CT and MRI and pathological features of hepatic epithelioid angiomyolipomaLIANG Xu, YAN Jia-xin, DENG He-ping356-3597Analysis on the risk factors of portal vein thrombosis in patients with liver cirrhosisZHOU Qing-nan, ZHANG Guo, NONG Bing360-3638Analysis of the correlation between sex hormones and body fat distribution in middle-aged male patients with diabetes mellitus type 2 and different somatotypesHUANG Jian-hao, LU Jie, YU Yan-qing363-3679Clinical efficacy of suspended core muscle group training in treatment of lumbar intervertebral disc herniationLI De-quan, LI Jia-hang, JIA Dan368-37210Analysis of the value of ultrasound combined with molybdenum target to avoid sentinel lymph node biopsy for early invasive breast cancerCHEN Huan, YANG Guang-lun, YANG Luo372-37511A study on the development of visual function in children with spontaneous regression of retinopathy of pre- maturitySUN Guang-hua, MAN Teng-teng, ZHANG Nan376-37912Analysis of hematological indexes and conditions of COVID-19 patients with different ages and underlying diseasesYU Qiao, JI Pan, ZHU Jie-yun380-38413The value of CURB-age score combined with inflammatory factor detection in predicting the short-term prog- nosis of elderly patients with community-acquired pneumoniaWANG Qing-xiu, LIU Jian-bo, SHAO Run-xia385-38914A study on the relationship of CK7, CK19 and p16 expressions in tonsil squamous cell carcinomaYAN Qizhang, CHEN Hai-bo, LU Ying389-39415Analysis of the influencing factors of type 2 diabetes mellitus patients complicated with hypertension in Nan- ning communitiesLIANG Qiu-li, WANG Jian, ZHOU Ji395-39916Research progress on the role of HMGB1 in myocardial ischemia-reperfusion injuryTANG Sen-hu410-41417Progress of the clinical study on machine perfusion preservation of donor livers after the death of citizensHUANG Xiao-chun414-41818Effect of underweight on female fertility and its treatmentCHE De-hui419-42219Research progress in multipotent pharmacological action of metforminYANG Zhou-sheng422-426 