Rockwood NJ, Jeon M. Estimating complex measurement and growth models using the R package PLmixed. Multivar Behav Res. 2019 Mar;54(2):288-306. doi: 10.1080/00273171.2018.1516541
Lincourt W, Stanford RH, Gilsenan A, DiBenedetti D, Ortega H. Assessing primary care physician`s beliefs and attitudes of asthma exacerbation treatment and follow-up. Open Respir Med J. 2010 Feb 22;4:9-14.