Gerlof Valk practices in Utrecht, Netherlands. Valk is rated as an Elite expert by MediFind in the treatment of Multiple Endocrine Neoplasia Type 1. They are also highly rated in 21 other conditions, according to our data. Their top areas of expertise are Multiple Endocrine Neoplasia, Multiple Endocrine Neoplasia Type 1, Pancreatic Islet Cell Tumor, Endoscopy, and Liver Transplant.