Write SQL query to solve given problem: How many papers were presented at 'ECSQARU' in 2003?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.Id) FROM Paper AS T1 INNER JOIN Conference AS T2 ON T1.ConferenceId = T2.Id WHERE T2.ShortName = 'ECSQARU' AND T1.Year = '2003'