Figure 2. Computer-aided survey system (CASS) with client/server mode using a WLAN.

The hosting system for the database resides on the server. The staff in each examination room can synchronously enter data in the database by logging into client application software installed on client computers using a wireless local area network (WLAN). After registration, blood is drawn. Eligible participants with no communicable blood diseases then continue on and participate in an interview and examination of the oral cavity, palmar skin, cervix/penis and esophagus.