Published: July 27, 2011 Publication: Downtown Express By Aline Reynolds and Terese Loeb Kreuzer For many years, free medical treatment has been available to residents, students and Lower Manhattan workers who were exposed to the Sept. 11, 2001 attack and its aftermath. But the James Zadroga 9/11 Health and Compensation Act that Pres. Barack Obama signed into law in January 2011 opened the Victim Compensation Fund to this group for the first time. Sheila Birnbaum, who was app