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. 2022 Feb 22;9:773000. doi: 10.3389/fmed.2022.773000

Table 1.

The number of different types of articles in the NMU research from 1987 to 2021.

Rank Type of documents Frequency Percentage (%)
1 ARTICLE 242 71.59
2 REVIEW 49 14.49
3 MEETING ABSTRACT 34 10.06
4 EDITORIAL MATERIAL 9 2.63
5 BOOK CHAPTER 4 1.18
6 CORRECTION 2 0.59
7 CONFERENCE PROCEEDINGS 2 0.59
8 PUBLISH ONLINE 1 0.29
9 NEWS ITEM 1 0.29
10 LETTER 1 0.29