Specific Rules #3 for Place of Conference (optional) to Citing Conference Proceedings Vancouver Style: No place for the conference can be found

If no place where the conference was held can be found, end the date information with a period instead of a semicolon.

Fitzpatrick DP, Carr AJ, editors. Bioengineering - in Ireland. Proceedings of the 7th Annual Conference of the Section of Bioengineering of the Royal Academy of Medicine in Ireland; 2001 Jan 27-28. Dublin: University College Dublin, Department of Mechanical Engineering; c2001. 43 p.

If neither the place where the conference was held nor a date for the conference can be found, end the conference title with a period.

Forestieri P, Mazzeo F, Varoux G, editors. Il carcinoma gastrico. SICO 1st Consensus Conference. Naples (Italy): Giuseppe de Nicola Editore; 2000. 190 p. Italian.

Según:

Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers [Internet]. 2nd edition. Chapter 3: Conference Publications

Related:

General Rules for Place of Conference (optional) to Citing Conference Proceedings Vancouver Style

Specific Rules #1 for Place of Conference (optional) to Citing Conference Proceedings Vancouver Style: Optional inclusion of institution where conference was held

Specific Rules #2 for Place of Conference (optional) to Citing Conference Proceedings Vancouver Style: Non-US cities

Specific Rules #3 for Place of Conference (optional) to Citing Conference Proceedings Vancouver Style: No place for the conference can be found

Example Entries for Place of Conference (optional) to Citing Conference Proceedings Vancouver Style