1. School of Nursing, Shanghai Jiao Tong University, Shanghai 200025, China
2. Florence Nightingale Faculty of Nursing, Midwifery and Palliative Care, King’s College London, London SE1 8WA, UK
3. Department of Children’s Disease Prevention, Jinyang Community Health Service Center, Shanghai 200136, China
4. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, 70182 Örebro, Sweden
5. Unit of Integrative Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, 17177 Stockholm, Sweden