Sources and limitations
Sources and limitations
This page explains where the information in the reference comes from, how we select it and where the limits lie of what a health reference site can offer. If you doubt a statement, it also explains how to check it yourself.
A reference is only as useful as it is honest about its limits. We try not to promise more than we can deliver.
How we choose sources
For specific figures and rules we use documents from international and national health organisations, legislation and systematic reviews. If a statement has no such source, we phrase it in general terms or do not publish it.
We do not rely on promotional material, reviews, social media posts or individual opinions not backed by data. We do not invent statistics or quote experts we have not spoken to.
Recommendations get updated. When a source changes, we correct the article rather than leave an outdated figure.
Every article ends with a list of sources — the titles of documents and names of organisations. Using these, you can find the original source yourself and compare the wording, especially if you are reading the article some time after it was prepared.
Main sources
- World Health Organization (WHO): guidelines and fact sheets
- WHO Regional Office for Europe
- Ministry of Health of the Russian Federation
- Labour Code of the Russian Federation
- Cochrane Library
- State Register of Medicines of the Russian Federation (GRLS, grls.rosminzdrav.ru)
- Peer-reviewed medical journals
- American Academy of Sleep Medicine and Sleep Research Society (2015 consensus)
Limitations of this reference
This reference does not replace a consultation with a doctor. We do not diagnose, prescribe treatment, give medicine doses or suggest treatment plans. General recommendations apply to the population as a whole and may not suit a particular person.
There are no specialists on the site answering readers' questions. We do not advertise clinics, medicines or dietary supplements, and we do not publish doctor rankings.
If you feel unwell right now, do not look for answers on the site: call 112, or 103 in Russia.
Related sections
- Reading research
How to read health research news: study types, verification steps and red flags.
- Methods and approaches
What counts as evidence-based, the main types of intervention and how to check a claim about a method.
- Home
An independent health literacy reference: prevention, methods, research and questions for your doctor.
Sources
- World Health Organization
- Ministry of Health of the Russian Federation
- Cochrane Library
- State Register of Medicines of the Russian Federation (GRLS)
Information is current as of the preparation date. The Russian check-up schedule, recommendations from health organisations and medicine registration rules may change — check current arrangements with your clinic and official sources.