In the paper, Retention of Adult Patients on Antiretroviral Therapy in Low- and Middle-Income Countries: Systematic Review and Meta-analysis 2008-2013, Matthew Fox and Sydney Rosen at Boston University estimated all-cause attrition (death and loss to follow-up) and retention for paediatric patients receiving first-line ART in routing settings.
[link url="http://journals.lww.com/aidsonline/Citation/2015/02200/Systematic_review_of_retention_of_pediatric.11.aspx"]AIDS journal abstract[/link]