Table 1. RPI-KD studies included in this literature review

Authors, reported year	Country	Methods1)	Study population
			RPI-KD (n)	KD (n)	Bacterial RPA (n)
Chen et al. [11], 2022	China	Single center	10	20	16
Lim et al. [12], 2020	Korea	Single center	11	–	36
Liu et al. [13], 2024	China	Single center	22	–	34
Nomura et al. [14], 2014	Japan	Single center	21	–	18
Tona et al. [15], 2014	Japan	Single center	10	267	–
Inagaki et al. [16], 2019	United States	Insurance data	130	20,657	–

All six are retrospective studies.
RPI-KD: Kawasaki disease with retropharyngeal inflammation; KD: Kawasaki disease; RPA: retropharyngeal abscess.