The following is a list of the "V" codes for MeSH

Mesh

Mesh consists of semi-permeable barrier made of connected strands of metal, fiber, or other flexible/ductile material. Mesh is similar to web or net in that it has many attached or woven strands.-Types of mesh:...

. It is a product of the United States National Library of Medicine

United States National Library of Medicine

The United States National Library of Medicine , operated by the United States federal government, is the world's largest medical library. Located in Bethesda, Maryland, the NLM is a division of the National Institutes of Health...

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Source for content is here. (File "2006 MeSH Trees".)

--- study characteristics (publication type)

--- clinical conference (publication type)

--- clinical trial

Clinical trial

Clinical trials are a set of procedures in medical research and drug development that are conducted to allow safety and efficacy data to be collected for health interventions...

 (publication type)

--- clinical trial, phase I (publication type) --- clinical trial, phase II (publication type) --- clinical trial, phase III (publication type) --- clinical trial, phase IV (publication type) --- controlled clinical trial (publication type) --- multicenter study (publication type) --- randomized controlled trial

Randomized controlled trial

A randomized controlled trial is a type of scientific experiment - a form of clinical trial - most commonly used in testing the safety and efficacy or effectiveness of healthcare services or health technologies A randomized controlled trial (RCT) is a type of scientific experiment - a form of...

 (publication type)

--- consensus development conference (publication type)

--- consensus development conference, NIH (publication type)

--- evaluation studies (publication type)

--- meta-analysis

Meta-analysis

In statistics, a meta-analysis combines the results of several studies that address a set of related research hypotheses. In its simplest form, this is normally by identification of a common measure of effect size, for which a weighted average might be the output of a meta-analyses. Here the...

 (publication type)

--- multicenter study (publication type)

--- scientific integrity review (publication type)

--- validation studies (publication type)