of;
Oral;
and;
Maxillofacial;
Surgery,;
Tsurumi;
University,;
Yokohama,;
Japan;
of;
Rheumatology;
and;
Clinical;
Immunology,;
Clinical;
Research;
Center;
for;
Rheumatology;
and;
Allergy,;
Sagamihara;
National;
Hospital,;
National;
Hospital;
Organization,;
Sagamihara,;
Japan;
of;
Biological;
Science;
Research;
Center;
for;
Odontology,;
Nippon;
Dental;
University;
School;
of;
Dentistry,;
Tokyo,;
Japan;
epidermal; growth; factor; receptor; immunohistochemistry; oral; leukoplakia; quantitative; real-time; polymerase; chain; reaction;