How many followers did the user who posted the list "Non-American Films about World War II" have?
the list "Non-American Films about World War II" refers to list_title = 'Non-American Films about World War II'
SELECT SUM(T2.list_followers) FROM lists_users AS T1 INNER JOIN lists AS T2 ON T1.list_id = T2.list_id WHERE T2.list_title LIKE 'Non-American Films about World War II'