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Addressing the issues that arise in anlysing multicentre cost data, with application to a multinational study
Thompson, Simon G., (2006)
METHODS FOR COVARIATE ADJUSTMENT IN COST‐EFFECTIVENESS ANALYSIS THAT USE CLUSTER RANDOMISED TRIALS
Gomes, Manuel, (2012)
Using multilevel models for assessing the variability of multinational resource use and cost data
Grieve, Richard, (2005)