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Marchionne's death mysterious, infection? preventable ?

[ElanS2]

Marchionne had been incapacitated about three weeks ago by the sudden onset of serious complications from a July 5 shoulder surgery he had undergone in Zurich.
Surgery should not lead to death, unless an infection ensues.  I do not know what interventions are associated with shoulder surgery. Could unsterile tools be behind this ?
Anyone have any connections with Zurich hospitals ?