TABLE 2. COVID-19 Dataset Sizes, Formats, and Download Links.

No.	Reference	# Images	Resolution	Format	URL
1	[18]	315		JPG	https://github.com/ieee8023/covid-chestxray-dataset
2	[20]	48	various	JPG, PNG	https://github.com/agchung/Figure1-COVID-chestxray-dataset
3	[61]	N/A	various	PNG	https://github.com/agchung/Actualmed-COVID-chestxray-dataset
4	[62]	2,905			https://github.com/tawsifur/COVID-19-Chest-X-ray-Detection
5	[63]	105		N/A	http://db.jsrt.or.jp/eng.php
6	[22] sometimes referenced as [64]	112,120		DICOM PNG	https://www.kaggle.com/c/rsna-pneumonia-detection-challenge/data
7	[65]	68	various	JPEG	https://www.sirm.org/category/senza-categoria/COVID-19/
8	[19]	N/A	various	JPEG and others	Radiopaedia.org
9	[66]	224,316		N/A	https://stanfordmlgroup.github.io/competitions/chexpert/
10	[67]	135	20122012	JPG	https://twitter.com/ChestImaging
11	[68] taken from [69]	5,856	various	JPEG	https://www.kaggle.com/andrewmvd/pediatric-pneumonia-chest-xray
12	[69] or [70] sometimes referenced as [23]	5,863	various	JPEG	https://www.kaggle.com/paultimothymooney/chest-xray-pneumonia
13	[71]	N/A	various	various	https://openi.nlm.nih.gov/