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Li,                Q, Guan,                X, Wu,                P, Wang,                X, Zhou,                L, Tong,                Y, et al.            Early transmission dynamics in Wuhan, China, of novel            coronavirus-infected pneumonia. N Engl J Med          2020;382: 1199\u2013207.","DOI":"10.1056\/NEJMoa2001316"},{"key":"2","doi-asserted-by":"publisher","unstructured":"2. Wang,              C, Horby,                PW, Hayden,                FG, Gao,                GF. A novel            coronavirus outbreak of global health concern. Lancet          2020;395: 470\u20133.","DOI":"10.1016\/S0140-6736(20)30185-9"},{"key":"3","unstructured":"3. Cucinotta,                D, Vanelli,                M. WHO            declares COVID-19 a pandemic. Acta Biomed          2020;91: 157\u201360."},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. 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Ital J Pediatr          2020;46: 165.","DOI":"10.1186\/s13052-020-00931-3"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Br\u00e4uner,                EV, Busch,                AS,                Eckert-Lind,              C, Koch,                T, Hickey,                M, Juul,                A. Trends in            the incidence of central precocious puberty and normal variant puberty among children in            Denmark, 1998 to 2017. JAMA Netw Open          2020;3: e2015665.","DOI":"10.1001\/jamanetworkopen.2020.15665"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Kim,              YJ, Kwon,                A, Jung,                MK, Kim,                KE, Suh,                J, Chae,                HW, et al.            Incidence and prevalence of central precocious puberty in Korea: An            epidemiologic study based on a national database. 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Causes,            diagnosis, and treatment of central precocious puberty. Lancet            Diabetes Endocrinol          2016;4: 265\u201374.","DOI":"10.1016\/S2213-8587(15)00380-0"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Wang,              Y. Is obesity            associated with early sexual maturation? A comparison of the association in American            boys versus girls. Pediatrics          2002;110: 903\u201310.","DOI":"10.1542\/peds.110.5.903"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Ribeiro,              J, Santos,                P, Duarte,                J, Mota,                J.            Association between overweight and early sexual maturation in Portuguese            boys and girls. Ann Hum Biol          2006;33: 55\u201363.","DOI":"10.1080\/00207390500434135"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. 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Pietrobelli,                A,              Pecoraro, L,                Ferruzzi,            A, Heo,                M, Faith,                M, Zoller,                T, et al.            Effects of COVID-19 lockdown on lifestyle behaviors in children with            obesity living in Verona, Italy: A longitudinal study. Obesity            (Silver Spring)          2020;28: 1382\u20135.","DOI":"10.1002\/oby.22861"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Stagi,              S,                Papacciuoli,              V, Boiro,                D,              Maggioli, C,                Ndambao,            NN, Losi,                S, et al.            Auxological and endocrinological features in internationally adopted            children. Ital J Pediatr          2020;46: 82.","DOI":"10.1186\/s13052-020-00832-5"},{"key":"22","doi-asserted-by":"publisher","unstructured":"22. Gur,              RE, Moore,                TM, Rosen,                AFG,                Barzilay,            R, Roalf,                DR,              Calkins, ME,              et al. Burden of environmental adversity            associated with psychopathology, maturation, and brain behavior parameters in            youths. JAMA Psychiatry          2019;76: 966\u201375.","DOI":"10.1001\/jamapsychiatry.2019.0943"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Xhrouet-Heinrichs,                D, Lagrou,                K,                Heinrichs,              C, Craen,                M, Dooms,                L, Malvaux,                P, et al.            Longitudinal study of behavioral and affective patterns in girls with            central precocious puberty during long-acting triptorelin therapy.            Acta Paediatr          1997;86: 808\u201315.","DOI":"10.1111\/j.1651-2227.1997.tb08602.x"},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Teilmann,                G,              Pedersen, CB,                Jensen, TK,                Skakkebaek,              NE, Juul,                A. Prevalence            and incidence of precocious pubertal development in Denmark: an epidemiologic study            based on national registries. Pediatrics          2005;116: 1323\u20138.","DOI":"10.1542\/peds.2005-0012"},{"key":"25","doi-asserted-by":"crossref","unstructured":"25. Hara,              T, Furuno,                K,              Yamamura, K,                Kishimoto,              J, Mizuno,                Y, Murata,                K, et al.            Assessment of pediatric admissions for Kawasaki disease or infectious            disease during the COVID-19 state of emergency in Japan. JAMA            Netw Open          2021;4: e214475.","DOI":"10.1001\/jamanetworkopen.2021.4475"},{"key":"26","doi-asserted-by":"crossref","unstructured":"26. 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