Instruct: Identify the main category of Medrxiv papers based on the titles
Query: Metal concentrations in breastmilk of Fuzhou nursing mothers associates with dietary and lifestyle factors
57
The categories of this paper are: primary
71
The categories of this paper are: ethics
52
The categories of this paper are: nursing
17
The categories of this paper are: informatics
48
The categories of this paper are: critical
50
The categories of this paper are: medical
3
The categories of this paper are: sexual
56
The categories of this paper are: research
27
The categories of this paper are: quality
41
The categories of this paper are: nephrology
11
The categories of this paper are: policy
54
The categories of this paper are: gynecology
63
The categories of this paper are: pain
21
The categories of this paper are: psychology
12
The categories of this paper are: genomic
46
The categories of this paper are: therapeutics