By referring to other conferences, we have a refund policy. If the conference receives your written cancellation email before 1 January 2020, the US$ 100 cancellation charge will be imposed and the balance registration fee will be returned to you. If the conference receives your written cancellation email between 1 January and 15 January 2020, the US$ 150 cancellation charge will be imposed and the balance registration fee will be returned to you. If the conference receives your written cancellation email between 16 January and 31 January 2020, the US$ 200 cancellation charge will be imposed and the balance registration fee will be returned to you. If the conference receives your written cancellation email between 1 February and 15 February 2020, the US$ 250 cancellation charge will be imposed and the balance registration fee will be returned to you. If the conference receives your written cancellation email after 15 February 2020, the paid registration fee will not be refunded.