TABLE.

Summary of Previous Deconvolution and Back Projection Models

Reference	Method Summary	Basis	Regularization	Extrapolation
Brookmeyer and Gail12	Back projection	Step	None	Binomial model for unseen cases after last date
Brookmeyer11	Back projection	Cubic spline	Second order difference squared	None
Liao and Brookmeyer14	Back projection	Step	Exponentiated transform squared: ${\displaystyle {\sum }_{j=2}^n}{(b_j^{1/p}-b_{j-1}^{1/p})}^2$	None
Becker et al.10	Back projection	Step	Local smoothing of EM update	None
Bacchetti et al.9	Back projection	Step	Second order difference squared	None
Goldstein et al.15	Richardson-Lucy	Step	Early stopping of update algorithm	None