title: Authors' reply.
authors.affiliation: Laboratory for Phototherapeutics in Oral Diseases, Discipline of Endodontics, University of Toronto, 124 Edward Street, Toronto ON M5G 1G6, Canada.
authors.forename: Annie
authors.initials: A
authors.lastname: Shrestha
authors.forename: Ma
authors.initials: M
authors.lastname: Mohamed-Tahir
authors.forename: Jayshree
authors.initials: J
authors.lastname: Hegde
authors.forename: Amir
authors.initials: A
authors.lastname: Azarpazhooh
authors.forename: Anil
authors.initials: A
authors.lastname: Kishen