The heads of 13 medical departments at Boston-based Beth Israel Deaconess Medical Center said they would collectively donate $350,000 to the Boston hospital in an effort to further reduce planned staff layoffs. They are also calling on hundreds of other doctors affiliated with Beth Israel Deaconess to donate money as a way to save colleagues' jobs. Beth Israel Deaconess said it is facing a $20 million loss in the current fiscal year, and would be looking at cost-cutting measures including layoffs.