(Reuters) -Abbott's quarterly revenue fell short of analysts' expectations on Wednesday, as weakness in its diagnostics and nutritional businesses failed to offset strong demand for its medical devices. Shares of the company dropped nearly 3% premarket following the results. Abbott's total revenue of $11.37 billion, slightly missed analysts' average estimate of$11.40 billion, according to data compiled by LSEG. Sales in its diagnostics segment fell 6.6% to $2.25 billion, missing the estimate of$2.29 b ...