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http://medworm.com/index.php?rid=170782697&cid=c_64_49_f&fid=33665&url=http%3A%2F%2Fjournals.lww.com%2Fmd-journal%2FFulltext%2F2016%2F03150%2FSystolic_Blood_Pressure_Variability_is_a_Novel.25.aspx