https://www.scirp.org/reference/referencespapers?referenceid=879566
He, J., Vupputri, S., Allen, K., et al. (1999) Passive smoking and the risk of coronary heart...
He, J., Vupputri, S., Allen, K., et al. (1999) Passive smoking and the risk of coronary heart diseasea meta-analisys of epidemiologic studies. The New England...