American software company Oracle has laid off hundreds of employees, cancelled job offers, and cut back open positions within its health unit Cerner, according to a report by Insider. Oracle's health unit includes electronic medical records firm Cerner which it acquired for $28.3 billion in December last year. The layoffs were largely due to Cerner's challenged work with the US Department of Veterans Affairs, which hired Cerner to replace its homemade medical records with new technology.