Breitung, J; Chaganty, NR; Daniel, RM; Kenward, MG; Lechner, M; Martus, P; Sabo, RT; Wang, YG; Zorn, C; (2010) Discussion of "Generalized Estimating Equations: Notes on the Choice of the Working Correlation Matrix". Methods of information in medicine, 49 (5). pp. 426-432. ISSN 0026-1270 https://researchonline.lshtm.ac.uk/id/eprint/2064 Full text not available from this repository.