Doctors from the United States who rushed to the Gaza Strip to help the war wounded quickly found themselves operating on patients who had fallen victim to the 20-month-border closure that had crippled Gaza's healthcare system even before Israel's offensive against Hamas. Even before the war, Gaza's hospitals had run out of 250 of the basic 1,000 healthcare items, and were short on 105 of 480 essential drugs, said Mahmoud Daher, a representative of the World Health Organization.