trim

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Utilities to estimate parameters of the models with survival functions 
             induced by stochastic covariates. Miscellaneous functions for data preparation 
             and simulation are also provided. For more information, see: (i) "Life tables 
             with covariates: Dynamic model for nonlinear analysis of longitudinal data" 
             by Akushevich, I. et al. (2005), Mathematical Population Studies 12(2), 51(80), 
             <DOI:10.1080/08898480590932296>; (ii) "Stochastic model for analysis of 
             longitudinal data on aging and mortality" by Yashin A. et al. (2007), 
             Mathematical Biosciences, 208(2), 538-551, <DOI:10.1016/j.mbs.2006.11.006>;
             (iii) "Health decline, aging and mortality: how are they related?" 
             by Yashin A. et al. (2007), 
             Biogerontology 8(3), 291(302), <DOI:10.1007/s10522-006-9073-3>.

trim: Returns string w/o leading or trailing whitespace

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