Acquired haemophilia A and late development of secondary autoimmune disorders, evidences from a single-centre observational study.

measurement is 17% for an effective laboratory (data not shown). This approach provides uncertainty in measurement estimates comparable with methods using proficiency testing data [9]. This is useful, as the forecast uncertainty in measurement of the future observable takes account of the two sides of analytic error, like the current approaches [8,9]. Indeed, the uncertainty in measurement of the future observable comes both from the method variance uncertainty and from the unknown mean target value [13].