“…From 689 publications identified in the search, 33 were included in this review, describing 34 methods ( Supplementary Material 2 ). From these, 5 distinct mathematical approaches to estimate the PCDP duration were identified: prevalence-to-incidence ratio [ 6 , 13 - 19 ], maximum likelihood estimation [ 7 , 12 , 18 , 20 - 32 ], expectation-maximization algorithm [ 33 ], regression of observed on expected [ 8 , 11 , 34 - 37 ], and Bayesian Markov-chain Monte Carlo estimation ( Table 2 ) [ 18 , 30 , 38 - 40 ]. Fourteen methods required data on a screened and an unscreened population [ 6 , 7 , 13 - 17 , 20 , 21 , 23 , 33 - 35 , 39 ], whereas 19 obtained estimates using only information from a screened population [ 8 , 11 , 12 , 18 , 19 , 22 , 24 - 32 , 36 - 38 , 40 ].…”