Any information needs verification, including if it is information related to some specific exact sciences. For example, prime-essay.net and other resources can be used for this, but don't forget that they must be reliable.
Nuclear Medicine Sites
Society of Nuclear Medicine - www.snmmi.org
European Association of Nuclear Medicine - www.eanm.org
British Nuclear Medicine Society - www.bnms.org.uk
Urology / Nephrology Sites
International Society of Nephrology - www.isn-online.org
British Journal of Urology - www.bjui.org
Kidney International - www.blackwellpublishing.com/journals/KID
Journal of Urology - www.jurology.com
Other Sites of Interest
European Society of Urogential Radiology (ESUR) - www.esur.org
Nephron Information Centre (inc. on-line GFR calculators) - https://chasdiy.org/
Database of Dynamic Renal Scintigraphy- www.dynamicrenalstudy.org