Table 2.

Harmonization techniques publicly available on GitHub.

Reference.	Harmonization Method	GitHub
Reinhold et al. [27]	Fuzzy C-means	https://github.com/jcreinhold/intensity-normalization, accessed on 9 September 2022
Reinhold et al. [27]	Gaussian mixture model (GMM)	https://github.com/jcreinhold/intensity-normalization, accessed on 11 October 2022
Reinhold et al. [27]	Kernel Density Estimate (KDE)	https://github.com/jcreinhold/intensity-normalization, accessed on 30 August 2022
Shinohara et al. [68]	Z-Score	https://github.com/jcreinhold/intensity-normalization, accessed on 8 October 2022; https://github.com/Jfortin1/RAVEL, accessed on 8 October 2022
Shinohara et al. [68]	White Stripe	https://github.com/jcreinhold/intensity-normalization, accessed on 11 September 2022; https://github.com/Jfortin1/RAVEL, accessed on 11 September 2022
Fortin et al. [69]	Ravel	https://github.com/jcreinhold/intensity-normalization, accessed on 12 August 2022; https://github.com/Jfortin1/RAVEL, accessed on 12 August 2022
Nyul et al. [70]	Histogram Matching	https://github.com/jcreinhold/intensity-normalization, accessed on 24 October 2022; https://github.com/Jfortin1/RAVEL, accessed on 24 October 2022; https://github.com/sergivalverde/MRI_intensity_normalization, accessed on 24 October 2022
Johnson et al. [71] Fortin et al. [28]	ComBat, M-Combat	https://github.com/Jfortin1/ComBatHarmonization, accessed on 18 September 2022; https://github.com/ncullen93/neuroCombat/tree/master/neuroCombat, accessed on 18 September 2022
Horng et al. [72]	Nested & GMM ComBat	https://github.com/hannah-horng/generalized-combat, accessed on 3 October 2022
Beer et al. [29]	Longitudinal ComBat	https://github.com/jcbeer/longCombat, accessed on 31 October 2022
Johnson et al. [71] Fortin et al. [28]	ComBaTool Standalone web application	https://forlhac.shinyapps.io/Shiny_ComBat/, accessed on 27 September 2022
Garcia-Dias et al. [73]	NeuroHarmony	https://github.com/garciadias/Neuroharmony, accessed on 23 August 2022
C. Ma et al. [30]	Deep Learning	https://github.com/horsepurve/StyleSegor, accessed on 21 September 2022
D. Tian et al. [31]	Deep Learning	https://github.com/DezhengTian/DeRed-Harmonization, accessed on 22 September 2022