How many papers were published by the "Virtual Reality, IEEE Annual International Symposium" conference in 2012?
'Virtual Reality, IEEE Annual International Symposium' is the FullName of conference; in 2012 refers to Year = 2012;
SELECT COUNT(T2.Id) FROM Conference AS T1 INNER JOIN Paper AS T2 ON T1.Id = T2.ConferenceId WHERE T1.FullName = 'Virtual Reality, IEEE Annual International Symposium' AND T2.Year = 2012