Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2020 Jun 11;9(6):e15922. doi: 10.2196/15922

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

©Danyal Zaman Khan, Muhammad Shuaib Khan, Mark RN Kotter, Benjamin Marshall Davies. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 11.06.2020.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Research Protocols, is properly cited. The complete bibliographic information, a link to the original publication on http://www.researchprotocols.org, as well as this copyright and license information must be included.

PMC Copyright notice

MEDLINE search strategy with the most common imprecision categories. CNS: cerebral nervous system; DCM: degenerative cervical myelopathy; MA: meta-analysis; SR: systematic review.