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				                                                                        中华人民共和国国家卫生健康委员会规划发展与信息化司. 2017 年我国卫生健康事业发展统计公报. Available from: http://www.nhc.gov.cn/guihuaxxs/s10743/201806/44e3cdfe11fa4c7f928c879d435b6a18.shtml.
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				                                                                        Clinical Trials Arena. Clinical trial delays: America’s patient recruitment dilemma. Available from: https://www.clinicaltrialsarena.com/analysis/featureclinical-trial-patient-recruitment/.
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				                                                                        National Cancer Institute. NCI’s National Clinical Trials Network. Available from: https://www.cancer.gov/research/areas/clinical-trials/nctn.
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				                                                                        National Institute of Neurological Disorders and Stroke. NIH Stroke Trials Network. Available from: https://www.nihstrokenet.org/.
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				                                                                        National Institute of Allergy and Infectious Disease. The HIV Prevention Trials Network. Available from: https://www.hptn.org/.
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				                                                                | 25. | 
				                                                                				                                                                       
				                                                                        National Institutes of Health. Funding Opportunity Announcement RFA-NS-13-012 NINDS Stroke Trials Network - National Clinical Coordinating Center (U01). Available from: https://grants.nih.gov/grants/guide/rfa-files/RFA-NS-13-012.html.
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				                                                                | 26. | 
				                                                                				                                                                       
				                                                                        National Institutes of Health. Funding Opportunity Announcement RFA-NS-13-016 NINDS Stroke Trials Network - National Data Management Center (U01). Available from: https://grants.nih.gov/grants/guide/rfa-files/RFA-NS-13-016.html.
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				                                                                | 27. | 
				                                                                				                                                                       
				                                                                        National Institutes of Health. Funding Opportunity Announcement RFA-NS-13-011 NINDS Stroke Trials Network - Regional Coordinating Stroke Centers (U10). Available from: https://grants.nih.gov/grants/guide/rfa-files/RFA-NS-13-011.html.
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				                                                                | 28. | 
				                                                                				                                                                       
				                                                                        National Institutes of Health. NIH Single IRB Policy for Multi-site Research. Available from: https://grants.nih.gov/policy/humansubjects/single-irb-policy-multi-site-research.htm.
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