Either PDT or scatter threshold laser coagulation may be performed first, and the time between the two therapies may be within {TAIL ~ a few minutes}, within {HEAD ~ a few hours}, within a few days, or up to ninety days 
Either PDT or scatter threshold laser coagulation may be performed first , and the time between the two therapies may be within { TAIL ~ a few minutes } , within { HEAD ~ a few hours } , within a few days , or up to ninety days
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH