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3. Oroantral communication;Ehrl;Int J Oral Surg,1980
4. A preliminary study of monocortical bone grafts for oroantral fistula closure;Hass;Oral Surg Oral Med Oral Pathol Oral Radiol Endod,2003
5. Operative method in fistulas to the maxillary sinus;Martensson;Acta Otolaryngol,1957