Place phobia is mainly manifested as fear of certain specific environments, such as high places, squares, objective environments, and crowded public places. It often starts with a spontaneous panic attack, and then produces anxiety about expectations and the behavior of avoidance, and finally becomes conditioning. Some clinical studies have shown that, patients with place phobia are often accompanied by panic attacks. However, some experts believe that the first panic attack is a necessary condition for the onset of  place phobia, and therefore claims that  place phobia is the consequence of the development of panic attacks and should be involved into the category of panic disorder.
The statement "The study found that the onset of place phobia was mostly in people's 40s, and the course of disease tended to be chronic" can most question the above experts' opinion.