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Chen LD, Huang ZR, Yang H, Cheng MQ, Hu HT, Lu XZ, Li MD, Lu RF, He DN, Lin P, Ma QP, Huang H, Ruan SM, Ke WP, Liao B, Zhong BH, Ren J, Lu MD, Xie XY, Wang W. US-based Sequential Algorithm Integrating an AI Model for Advanced Liver Fibrosis Screening. Radiology 2024; 311:e231461. [PMID: 38652028 DOI: 10.1148/radiol.231461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Background Noninvasive tests can be used to screen patients with chronic liver disease for advanced liver fibrosis; however, the use of single tests may not be adequate. Purpose To construct sequential clinical algorithms that include a US deep learning (DL) model and compare their ability to predict advanced liver fibrosis with that of other noninvasive tests. Materials and Methods This retrospective study included adult patients with a history of chronic liver disease or unexplained abnormal liver function test results who underwent B-mode US of the liver between January 2014 and September 2022 at three health care facilities. A US-based DL network (FIB-Net) was trained on US images to predict whether the shear-wave elastography (SWE) value was 8.7 kPa or higher, indicative of advanced fibrosis. In the internal and external test sets, a two-step algorithm (Two-step#1) using the Fibrosis-4 Index (FIB-4) followed by FIB-Net and a three-step algorithm (Three-step#1) using FIB-4 followed by FIB-Net and SWE were used to simulate screening scenarios where liver stiffness measurements were not or were available, respectively. Measures of diagnostic accuracy were calculated using liver biopsy as the reference standard and compared between FIB-4, SWE, FIB-Net, and European Association for the Study of the Liver guidelines (ie, FIB-4 followed by SWE), along with sequential algorithms. Results The training, validation, and test data sets included 3067 (median age, 42 years [IQR, 33-53 years]; 2083 male), 1599 (median age, 41 years [IQR, 33-51 years]; 1124 male), and 1228 (median age, 44 years [IQR, 33-55 years]; 741 male) patients, respectively. FIB-Net obtained a noninferior specificity with a margin of 5% (P < .001) compared with SWE (80% vs 82%). The Two-step#1 algorithm showed higher specificity and positive predictive value (PPV) than FIB-4 (specificity, 79% vs 57%; PPV, 44% vs 32%) while reducing unnecessary referrals by 42%. The Three-step#1 algorithm had higher specificity and PPV compared with European Association for the Study of the Liver guidelines (specificity, 94% vs 88%; PPV, 73% vs 64%) while reducing unnecessary referrals by 35%. Conclusion A sequential algorithm combining FIB-4 and a US DL model showed higher diagnostic accuracy and improved referral management for all-cause advanced liver fibrosis compared with FIB-4 or the DL model alone. © RSNA, 2024 Supplemental material is available for this article. See also the editorial by Ghosh in this issue.
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Affiliation(s)
- Li-Da Chen
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Ze-Rong Huang
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Hong Yang
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Mei-Qing Cheng
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Hang-Tong Hu
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Xiao-Zhou Lu
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Ming-De Li
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Rui-Fang Lu
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Dan-Ni He
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Peng Lin
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Qiu-Ping Ma
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Hui Huang
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Si-Min Ruan
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Wei-Ping Ke
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Bing Liao
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Bi-Hui Zhong
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Jie Ren
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Ming-De Lu
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Xiao-Yan Xie
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
| | - Wei Wang
- From the Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound (L.D.C., Z.R.H., M.Q.C., H.T.H., M.D. Li, R.F.L., H.H., S.M.R., W.P.K., M.D. Lu, X.Y.X., W.W.), Department of Traditional Chinese Medicine (X.Z.L.), Department of Pathology (B.L.), Department of Gastroenterology (B.H.Z.), and Department of Hepatobiliary Surgery (M.D. Lu), the First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Rd 2, Guangzhou 510080, People's Republic of China; Department of Medical Ultrasound, the First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China (H.Y., P.L.); Department of Medical Ultrasonics, the Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, People's Republic of China (D.N.H.); and Department of Medical Ultrasonics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China (Q.P.M., J.R.)
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