inclusion criteria: * healthy participants aged 3-11 years; * the participants and/or their guardians are able to understand and sign the informed consent voluntarily (in accordance with the local regulations)(for subjects aged 3-7years ,guardians need to sign the informed consent form,for subjects aged 8-17 years, both subjects and guardians need to sign the informed consent form); * able to comply with study procedures based on the assessment of the investigator * must be willing to provide verifiable identification (in accordance with the local regulations), has means to be contacted and to contact the investigator during the study.

inclusion criteria: * healthy participants aged 3-11 years; * the participants and/or their guardians are able to understand and sign the informed consent voluntarily (in accordance with the local regulations)(for subjects aged 3-7years ,guardians need to sign the informed consent form,for subjects aged 8-17 years, both subjects and guardians need to sign the informed consent form); * able to comply with study procedures based on the assessment of the investigator * must be willing to provide verifiable identification (in accordance with the local regulations), has means to be contacted and to contact the investigator during the study.

inclusion criteria: healthy participants aged 3-11 years; the participants and/or their guardians are able to understand and sign the informed consent voluntarily (in accordance with the local regulations)(for subjects aged 3-7years ,guardians need to sign the informed consent form,for subjects aged 8-17 years, both subjects and guardians need to sign the informed consent form); able to comply with study procedures based on the assessment of the investigator must be willing to provide verifiable identification (in accordance with the local regulations), has means to be contacted and to contact the investigator during the study.

inclusion criteria: healthy participants aged 3-11 years; the participants and/or their guardians are able to understand and sign the informed consent voluntarily (in accordance with the local regulations)(for subjects aged 3-7years ,guardians need to sign the informed consent form,for subjects aged 8-17 years, both subjects and guardians need to sign the informed consent form); able to comply with study procedures based on the assessment of the investigator must be willing to provide verifiable identification (in accordance with the local regulations), has means to be contacted and to contact the investigator during the study.