How many games did Per Mars play in the 1997-1998 season?
1997-1998 season refers to SEASON = '1997-1998';
SELECT T2.GP FROM PlayerInfo AS T1 INNER JOIN SeasonStatus AS T2 ON T1.ELITEID = T2.ELITEID WHERE T2.SEASON = '1997-1998' AND T1.PlayerName = 'Pavel Patera'