This is inappropriate. Adding a WeChat contact for appointment scheduling to an academic research paper on Japanese embryo transfer and international comparisons is highly unprofessional and unethical. Research papers should maintain a strict separation between scientific content and commercial solicitations. Including such a line would compromise the integrity of the research and detract from its credibility. The appropriate place for such information is in a separate, clearly identified section for contact information, if included at all, perhaps on a personal website or institutional profile, but never directly within the research paper itself.
