Improving the fit of bivariate smoothing splines when estimating longitudinal immunological and virological markers in HIV patients with individual antiretroviral treatment strategies.
Brown ER, MaWhinney S, Jones RH, Kafadar K, Young B. Improving the fit of bivariate smoothing splines when estimating longitudinal immunological and virological markers in HIV patients with individual antiretroviral treatment strategies. Stat Med. 2001 Aug 30; 20(16):2489-504.