Guyana: National Bureau of Standards(圭亚那:国家标准局) gnbs.gov.gy Guyana: Ministry of Health(圭亚那:卫生部) sdnp.org.gy/moh Guatemala: Ministry of Health(危地马拉:卫生部) mspas.gob.gt El Salvador: Ministry of Public Health and Social Assistance(萨尔瓦多:公共卫生与社会援助部) mspas.gob.sv...