REAGENT or RESOURCE	SOURCE	IDENTIFIER
Software and Algorithms
R-3.6.3	R Foundation for Statistical Computing	https://www.r-project.org/
SPSS statistics 23.0	IBM Corporation	http://www.spss.com.hk/software/statistics/
Coxme-2.2.16	Therneau et al.	https://cran.r-project.org/web/packages/coxme/index.html
Matchit-3.0.2	Daniel et al.	https://cran.r-project.org/web/packages/MatchIt/index.html
Matching-4.9-7	Sekhon et al.	https://cran.r-project.org/web/packages/Matching/
Tableone-0.11.1	Kazuki Yoshida	https://github.com/kaz-yos/tableone
DoBy-4.6.6	Søren Højsgaard	https://cran.r-project.org/web/packages/doBy/index.html
Survival-3.1-12	Therneau et al.	https://cran.r-project.org/web/packages/survival/index.html
Rms-6.0-0	Frank E Harrell Jr	https://cran.r-project.org/web/packages/rms/index.html
Nnet-7.3-14	Ripley et al.	https://cran.r-project.org/web/packages/nnet/index.html
Car-3.0-8	Fox et al.	https://cran.r-project.org/web/packages/car/index.html
Mgcv-1.8-31	Wood	https://cran.r-project.org/web/packages/mgcv/index.html
Hmisc-4.4-0	Harrell et al.	https://cran.r-project.org/web/packages/Hmisc/index.html
Survey-4.0	Lumley	https://cran.r-project.org/web/packages/survey/index.html
MASS-7.3-51.6	Venables et al.	https://cran.r-project.org/web/packages/MASS/index.html
Landest-1.0	Parast	https://cran.r-project.org/web/packages/landest/index.html
Matrix-1.2-18	Bates et al.	https://cran.r-project.org/web/packages/Matrix/index.html