Improved social services and the burden of post-traumatic stress disorder among economically vulnerable people after a natural disaster: a modelling study oleh Gregory H Cohen, MPhil, Shailesh Tamrakar, MS, Sarah Lowe, PhD, Laura Sampson, BA, Catherine Ettman, BA, Dean Kilpatrick, ProfPhD, Benjamin P Linas, MD, Kenneth Ruggiero, ProfPhD, Sandro Galea, ProfMD