HLA-A and Autoimmunity: Second, even though our results were confirmed in all sensitivity analyses, the main complete case integrative analysis was performed in 66% (57/87) HLA-A*0201 positive patients, accounting for a potential lack of power that may have affected results on the effects of autoimmunity and SEM model identifiability (generally the greater the model complexity, the more observations are needed), questioning the need for additional methods such as multiple imputation.