| World Health Organization | http://www.who.int/en/ |
| Food and Drug Administration (FDA) | http://www.fda.gov/ |
| Centers for Disease Control and Prevention (CDC) | http://www.cdc.gov/ |
| National Institutes of Health | http://www.nih.gov/ |
| National Library of Medicine | http://www.nlm.nih.gov/ |
| The National Guideline Clearinghouse(NGC) | http://www.guideline.gov/ |
| Accreditation Council for Continuing Medical Education | http://www.accme.org/ |
| Alliance for Continuing Medical Education (ACME) | http://www.acme-assn.org/ |
| American Medical Association (AMA) | http://www.ama-assn.org/ |
| British Columbia Centre for Disease Control | http://www.bccdc.org/ |
| British Medical Association | http://www.bma.org.uk/ |
| Doctor's Guide | http://www.docguide.com/ |
| Medscape | http://www.medscape.com/medscapetoday |
| MDConsult | http://www.mdconsult.com/ |
| Medical pages | http://www.medicalpages.co.uk/index.php |
| National Health Service (NHS) | http://www.nhs.uk/Pages/homepage.aspx |
| NetDoctor.co.uk | http://www.netdoctor.co.uk/ |
| Chinese Center for Disease Control and Prevention (中国疾病预防控制中心) | http://www.chinacdc.net.cn |
| Chinese Medical Association (中华医学会) | http://www.cma.org.cn/ |
| Department of Health of HK | http://sc.info.gov.hk/gb/www.dh.gov.hk/index.html |
| The Hong Kong Medical Association | http://www.hkma.com.hk/index.htm |
| British Medical Association - Hong Kong Branch | http://hkbma.homestead.com/ |
| DXY(丁香园) | http://www.dxy.cn/ |
| MEDCyber (医学空间) | http://www.medcyber.com/ |
| Haoyisheng (好医生) | http://www.haoyisheng.com/ |
| American College of Cardiology | http://www.acc.org/ |
| American Society of Nuclear Cardiology | http://www.asnc.org/ |
| Heart Rhythm Society | http://www.hrsonline.org/ |
| Cardiosource | http://www.cardiosource.com/ |
| European Society of Cardiology (ESC) | http://www.escardio.org/ |
| British Cardiovascular Society | http://www.bcs.com/pages/default.asp |
| 心血管网 | http://www.365heart.com/ |
| Hong Kong College of Cardiology | http://www.hkcchk.com/ |
| American Neurological Association | http://www.aneuroa.org/ |
| American Stroke Association | http://www.strokeassociation.org/presenter.jhtml?identifier=1200037 |
| American Epilepsy Society | http://www.aesnet.org/ |
| Alzheimer Disease Education Referral Center | http://www.nia.nih.gov/alzheimers |
| Alzheimer Association | http://www.alz.org/ |
| American Parkinson’s Disease Association | http://www.apdaparkinson.org/user/index.asp |
| ALS Association | http://www.alsa.org/ |
| American Pain Society | http://www.ampainsoc.org/ |
| American Society of Neurorehabilitation | http://www.asnr.com/ |
| European Parkinson's Disease Association | http://www.epda.eu.com/ |
| The European Progressive Supranuclear Palsy Association | http://www.pspeur.org/ |
| The National Society for Epilepsy | http://www.epilepsynse.org.uk/pages/index/home/ |
| The Infectious Diseases Society of America (IDSA) | http://www.idsociety.org/ |
| Center for Complex Infectious Diseases | http://www.ccid.org/ |
| American Society for Microbiology (ASM) | http://www.asm.org/ |
| Association for Professionals in Infection Control and Epidemiology (APIC) | http://www.apic.org//AM/Template.cfm?Section=Home |
| International Society for Infectious Diseases (ISID) | http://www.isid.org/ |
| Health Protection Agency Centre for Infections | http://www.hpa.org.uk/infections/default.htm |
| The British Society for Antimicrobial Chemotherapy | http://www.bsac.org.uk/ |
| Society of Infectious Diseases，CMA （中华医学会感染病学分会） | http://www.infectcma.org.cn/ |
| Hong Kong Society for Infectious Diseases | http://www.hksid.org/ |
| American Dermatological Association (ADA) | http://www.amer-derm-assn.org/ |
| American Academy of Dermatology | http://www.aad.org/default.htm |
| American Society for Dermatologic Surgery (ASDS) | http://www.asds.net/Default.htm |
| British Association of Dermatologists | http://www.bad.org.uk/about/ |
| British Society for Investigative Dermatology | http://www.bsid.org.uk/utility/links/index.asp |
| DermAltas | http://dermatlas.med.jhmi.edu/derm/ |
| Hong Kong Society of Dermatology and Venereology | http://www.medicine.org.hk/hksdv/home.htm |
| Chinese Society of Dermatology (中华医学会皮肤性病学分会) | http://www.csdnet.org/ |
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