Table 1.

The composition of three sieve group.

PHI type	Pattern matching	Dictionary matching	Machine learning
EMAIL	x
URL	x
FAX	x
PHONE	x
MEDICALRECORD	x
LICENSE	x
USERNAME	x
IDNUM	x
DATE	x		x
AGE	x		x
COUNTRY		x	x
STATE		x	x
CITY		x	x
STREET	x	x	x
HOSPITAL	x	x	x
ORANIZATION	x	x	x
DOCTOR	x	x	x
PATIENT	x	x	x
PROFESSION		x	x
LOCATION_OTHER			x