gawande, thank you so much for talking with us. so we just did hear from an er physician and also the c.e.o. of a hospital about how difficult conditions are for the workers in these hospitals health care settings. you have been looking at lessons learned possibly from asia. what are you finding? are seeing in italy is thet we hospitals themselves have become a source of infection. by contrast in hong kong and singapore, they were le to control the infectvery effectively. they had a play book and it worked. they managed t keep infections spreading inside hospitals to patients or to clinicians. and so we need to follow that playbook. >> woodruff: and what are some have written about this, about the type of masks they wore anwd ng they wore them, about simple things like hand washing. what did you e? >> well, first of all they started by saying when you come in to rk, they would do a health check on every health care work to seee, do you hav any symptoms like a fever, akoff. or any other kinds of flu-like symptoms. and then you would