REFERENCES
1. The Lancet. Emerging understandings of 2019-nCoV. Lancet . 2020;395(10221):311. doi:10.1016/S0140-6736(20)30186-0
2.  Zhu N, Zhang D, Wang W, Li X, Yang B, Song J, et al. A novel coronavirus from patients with pneumonia in China, 2019. N Engl J Med. 2020;382(8):727–733. doi: 10.1056/NEJMoa2001017.
3. World Health Organisation (WHO) Coronavirusdisease (COVID-19) Outbreakwebpage. Available at: Https://Www.Who.Int/Emergencies/Diseases/Novel-Coronavirus-2019 .
4. Li Q, Guan X, Wu P, et al. Early transmission dynamics in Wuhan, China, of novel coronavirus-infected pneumonia. N Engl J Med . 2020;382(13):1199-1207. doi:10.1056/NEJMoa2001316
5. Wang D, Hu B, Hu C, et al. Clinical Characteristics of 138 Hospitalized Patients with 2019 Novel Coronavirus-Infected Pneumonia in Wuhan, China. JAMA - J Am Med Assoc . 2020;323(11):1061-1069. doi:10.1001/jama.2020.1585
6. Huang C, Wang Y, Li X, et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. Lancet . 2020;395(10223):497-506. doi:10.1016/S0140-6736(20)30183-5
7. Guan WJ, Ni ZY, Hu Y, Liang WH, Ou CQ, He JX, et al. Clinical characteristics of coronavirus disease 2019 in China. N Engl J Med. 2020. 10.1056/NEJMoa2002032
8.   Kui L, Fang YY, Deng Y, Liu W, Wang MF, Ma JP, et al. Clinical characteristics of novel coronavirus cases in tertiary hospitals in Hubei Province. Chin Med J. 2020. 10.1097/CM9.0000000000000744
9. Chung M, Bernheim A, Mei X, et al. CT imaging features of 2019 novel coronavirus (2019-NCoV). Radiology . 2020;295(1):202-207. doi:10.1148/radiol.2020200230
10. Bernheim A, Mei X, Huang M, et al. Chest CT findings in coronavirus disease 2019 (COVID-19): Relationship to duration of infection.Radiology . 2020;295(3):685-691. doi:10.1148/radiol.2020200463
11. Chan JFW, Yuan S, Kok KH, et al. A familial cluster of pneumonia associated with the 2019 novel coronavirus indicating person-to-person transmission: a study of a family cluster. Lancet . 2020;395(10223):514-523. doi:10.1016/S0140-6736(20)30154-9
12. Phan LT, Nguyen T V., Luong QC, et al. Importation and human-to-human transmission of a novel coronavirus in Vietnam. N Engl J Med . 2020;382(9):872-874. doi:10.1056/NEJMc2001272
13. Li Y, Zhang J, Wang N, et al. Therapeutic drugs targeting 2019-ncov main protease by highthroughput screening. bioRxiv. 2020. doi: 2020.01.28.922922.
14. Wang M, Cao R, Zhang L, et al. Remdesivir and chloroquine effectively inhibit the recently emerged novel coronavirus (2019-nCoV) in vitro. Cell Res. 2020;30:269-271.
15. Richardson P, Griffin I, Tucker C, et al. Baricitinib as potential treatment for 2019-nCoV acute respiratory disease. Lancet. 2020;395:e30-e31.
16. Wang W, Tang J, Wei F. Updated understanding of the outbreak of 2019 novel coronavirus (2019-nCoV) in Wuhan, China. J Med Virol . 2020;92(4):441-447. doi:10.1002/jmv.25689
17. Xie X, Zhong Z, Zhao W, Zheng C, Wang F, Liu J. Chest CT for Typical 2019-nCoV Pneumonia: Relationship to Negative RT-PCR Testing.Radiology . Published online February 12, 2020:200343. doi:10.1148/radiol.2020200343
18. Wong SH, Lui RNS, Sung JJY. Covid-19 and the digestive system.J Gastroenterol Hepatol . 2020;35(5):744-748. doi:10.1111/jgh.15047
19. Song Y, Liu P, Shi XL, et al. SARS-CoV-2 induced diarrhoea as onset symptom in patient with COVID-19. Gut . 2020;69(6). doi:10.1136/gutjnl-2020-320891
20. Lechien JR, Chiesa-Estomba CM, De Siati DR, et al. Olfactory and gustatory dysfunctions as a clinical presentation of mild-to-moderate forms of the coronavirus disease (COVID-19): a multicenter European study. Eur Arch Oto-Rhino-Laryngology . Published online 2020. doi:10.1007/s00405-020-05965-1
21. Hamm M, Wawroschek F, Weckerman D, et al. Unenhanced helical computed tomography in the evaluation of acute flank pain. Eur Urol. 2001;39:460-465.
22. Abdel-Gawad M, Kadasne R, Anjikar C, et al. Value of color Doppler ultrasound, KUB and urinalysis in diagnosis of renal colic due to ureteral stones. Int Braz J Urol. 2014;40:513-519.
23. Smith-Bindman R, Aubin C, Bailitz J, et al. Ultrasonography versus computed tomography for suspected nephrolithiasis. N Engl J Med 2014;371:1100e10
24. Ekici S, Sinanoglu O. Comparison of conventional radiography combined with ultrasonography versus nonenhanced helical computed tomography in evaluation of patients with renal colic. Urol Res. 2012;40:543-547
25. Ripollés T, Agramunt M, Errando J, et al. Suspected ureteral colic: plain film and sonography vs unenhanced helical CT. A prospective study in 66 patients. Eur Radiol. 2004;14:129-136
26. Chang H, Dai J, Holt S, et al. National imaging trends for acute kidney stone disease: do renal ultrasounds for nephrolithiasis in the emergency department pave the way to computerized tomography? J Urol. 2018;199:e683-e684.
27. Coursey CA, Casalino DD, Remer EM, et al. ACR Appropriateness Criteria acute onset flank painesuspicion of stone disease. Ultrasound Q 2012;28:227e33.
28. Schoenfeld EM, Pekow PS, Shieh MS, et al. The diagnosis and management of patients with renal colic across a sample of US hospitals: high CT utilization despite low rates of admission and inpatient urologic intervention. PLoS One. 2017;12: e0169160.
29. Fang Y, Zhang H, Xie J, et al. Sensitivity of Chest CT for COVID-19: Comparison to RT-PCR. Radiology . Published online February 19, 2020:200432. doi:10.1148/radiol.2020200432
30. Gauss H. Abdominal pain in pneumonia. Jour D D 1946;13:73–7. https://doi.org/ 10.1007/BF03002754.
31. Grief SN, Loza JK. Guidelines for the evaluation and treatment of pneumonia. Prim
TABLE 1 Patients Characteristics and clinical features