ๅดๅๅจฅๅจๅฝ็ซๅฅๅบทๅญฆ้ข (National Institute of Health) ๆค็็ ็ฉถ้ขๅฎๆ่ถ ๅๅฃซ็ ็ฉถใๅฅน็ฐไปป่ๆง้ๅฑฑๅ ๅทๅคงๅญฆๅๆง้ๅฑฑ้ไผๅไบบๅป้ขใๅๅจฅไป2005ๅนดๅผๅงๅจ็พๅๆ ๅฟๅ ณๆ่็ๆ ไปปๅฟๅทฅใๅฅนๆพๅ่ฟไธญ่ฑๅฃ/็ฌ่ฏๅๅฟๅทฅๅน่ฎญ่ฎฒๅใๅฅน็ธไฟกๆญปไบกๆฏ็ๅฝไธไธช่ช็ถ็่ฟ็จ๏ผๅฆๆ้ๅฝ็ๅๅค๏ผ็ๅฝไธ็จๅฏไปฅๆฏ้ๅธธๅฎ็พ็ใ