Table: fc_barcelona_player_stats_2
Columns: ranking
nationality
name
position
years
league
europe
others
total

Question: What is the sum of the Europe totals for players with other appearances of 0, league appearances under 328, and a position of MF?
SQL: SELECT SUM("europe") FROM fc_barcelona_player_stats_2 WHERE "others" = 0 AND "league" < 328 AND "position" = 'mf'