The effectiveness of an expressive writing diary on preoperative anxiety in breast cancer patients undergoing surgery: a mixed methods intervention design. - Wanchitnai N; Tongsai S; Ratta-Apha W; Chimchalong R; Chuthapisith S; Klankluang W (Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer, 2025)