“…On the other hand, preliminary comparisons of baseline and follow-up data in the MC-Cohort study show that PCPs underreported an average of 0.7 chronic conditions in both interviews, suggesting that the actual prevalence in the MC-Cohort population is even higher. Also, PCPs may overlook complaints not presented by the patient or complaints that the PCPs do not consider to be severe or precise enough, for example, mental health complaints [20] or cognitive impairment [21,22]. As a result, caution is indicated when estimating multimorbidity prevalence as small differences in study design may have great consequences on figures.…”