1. Cases like Debra Neill's may worry prospective study -abroad students or their parents. 2. To further investigate the link, the prospective study into the link. 3. Additional prospective studies are necessary to further understand, characterize, diagnose, and treat NDPH. 4. The theory is consistent with an extensive evidence-base of cross-sectional and prospective studies . 5. Doll and Hill also started a long-term prospective study of smoking and health. 6. Gilbert 2005 describes a prospective study of persons in Florida > 45 years old. 7. The prospective study is important for research on the etiology of diseases and disorders. 8. Larger prospective studies are needed to further characterize the phenotype. 9. These can include case control studies or prospective studies . 10. A prospective study comparing declawing with tendonectomy noted many medical as well as behavior complications.