It is acceptable to write from experience if editing under one's real name rather than a username, although material should preferably still be supported by reliable external sources whenever it is likely that such exists for the topic of a sentence or section. Such external sources should, where available, be secondary ones such as textbooks and reviews rather than primary studies.
When editing under one's real name, it is also acceptable to use a hospital as a reference for local practices, as for example in [[X-ray of knee prosthesis#Reporting]]. ==Geographic origin==Geographic origin should also be specified in the text for guidelines or other information that are expected to vary, including positive and negative predictive values of investigations (which depend on prevalences and incidences in the population). On the other hand, any geographic origin does not need to be stated for more universal knowledge such as sensitivity and specificity of investigations (which are independent on prevalences and incidences), or imaging findings. Geographic origin can be given in prose such as ''"a US practice is to..."'', or in the beginning of a reference, such as:*'''USA:''' {{cite journal|last1=Raman|first1=Siva P.|last2=Fishman|first2=Elliot K.|title=Bladder Malignancies on CT: The Underrated Role of CT in Diagnosis|journal=American Journal of Roentgenology|volume=203|issue=2|year=2014|pages=347–354|issn=0361-803X|doi=10.2214/AJR.13.12021}}
===Coding===