Notes on verification

Corroborated by peer-reviewed medical history articles, primary source letters from the Mozart family, and multiple secondary historical accounts that converge on the same documentation. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.983 clusters=3 claim_tier=notable | framework convergence=partial on Mozart family correspondence (letters of Leopold and Nannerl Mozart) as compiled in the standard scholarly edition of Mozart's letters (upstreams: Leopold Mozart's letters, Nannerl Mozart's recollections, Bauer & Deutsch, 'Mozart: Briefe und Aufzeichnungen' (1962)) — publishers independent, evidence may not be | kind=empirical eligibility=high (extractor: empirical/medium)]