1NIOSH Criteria for a recommended standard.Occupational exposure to respirable coal dust crystalline silica[S].US department of health services.Government printing office,Washington,DC,1995.4-5,95,143.
3Guidelines for the use of ILO international classification of radiographs of silicosis[S].Rev.ed.Geneva,Switzerland:International Labour Office,Occupational Safety and Health Series No.22.
4NIOSH Criteria for a recommended standard.Occupational exposure to crystalline silica[S].US department of health,education and welfare.Government printing office,Washington,DC,1974:36-37,39-40,78-79.
5Rosenman KD,Reilly MJ,Kalinowski DJ,et al.Silicosis in the 1990s[J].Chest,1997,111:779-786.
6Law YW,Leung MC,Leung CC,et al.Characteristics of workers attending the silicosis clinic for silicosis assessment in Hong Kong:retrospective study [J].Hong Kong Med J,2001,7:343-349.
7Finkelstein MM.Silicosis surveillance in Ontario:detection rates,modifying factors,and screening intervals[J].Am J Ind Med,1994,25:257-266.
8Hnizdo E.Sluis-Cremer GK.Risk of sillicosis in acohort of white South African gold miners[J].Am J Ind Med,1993,24:447-457.
9Lee HS,Phoon WH,Ng TP.Radiologicalprogression and its predictive risk factors in sillcosis[J].Occup Environ Med,2001,58:467-471.
10Ogawa S,Imai H,Ikeda M.A 40-year follow-up of whetstone cutters on silicosis[J].Ind Health,2003,41:69-76.
