Instruct: Identify the main category of Medrxiv papers based on the titles
Query: Calprotectin and inflammation-associated serum biomarkers determine critical illness in COVID-19
25
The categories of this paper are: improvement
20
The categories of this paper are: psychiatry
62
The categories of this paper are: orthopedics
73
The categories of this paper are: toxicology
63
The categories of this paper are: pain
3
The categories of this paper are: sexual
28
The categories of this paper are: nutrition
31
The categories of this paper are: imaging
49
The categories of this paper are: intensive
70
The categories of this paper are: otolaryngology
59
The categories of this paper are: respiratory
13
The categories of this paper are: genetic
40
The categories of this paper are: geriatric
37
The categories of this paper are: aids
4
The categories of this paper are: reproductive
38
The categories of this paper are: hiv