CREATE TABLE "table1_15988037_4" (
  "season" text,
  "no_of_stars" real,
  "no_of_weeks" real,
  "duration_dates" text,
  "winner" text,
  "second_place" text,
  "third_place" text
);

Question: Who got second place when the winners were rafał mroczek & aneta piotrowska?
SQL: SELECT "second_place" FROM "table1_15988037_4" WHERE "winner"='Rafał Mroczek & Aneta Piotrowska';