Participants dressed as Santa Claus take part in the Zagreb Advent Run in Zagreb, Croatia, Dec. 8, 2019. The fourth edition of the charity race Zagreb Advent Run kicked off here on Sunday to raise public awareness of skin cancer. (Luka Stanzl/Pixsell via Xinhua)

Participants dressed as Santa Claus take part in the Zagreb Advent Run in Zagreb, Croatia, Dec. 8, 2019. The fourth edition of the charity race Zagreb Advent Run kicked off here on Sunday to raise public awareness of skin cancer. (Luka Stanzl/Pixsell via Xinhua)

Participants dressed as Santa Claus take part in the Zagreb Advent Run in Zagreb, Croatia, Dec. 8, 2019. The fourth edition of the charity race Zagreb Advent Run kicked off here on Sunday to raise public awareness of skin cancer. (Luka Stanzl/Pixsell via Xinhua)

Participants dressed as Santa Claus take part in the Zagreb Advent Run in Zagreb, Croatia, Dec. 8, 2019. The fourth edition of the charity race Zagreb Advent Run kicked off here on Sunday to raise public awareness of skin cancer. (Luka Stanzl/Pixsell via Xinhua)