Structure of writing up the evidence map

Once you have generated the plots and tables, and charts, it is time to write the results. In the results section, write the distribution of the different types of studies that you have seen, and the results. Then identify and comment on the pattern of the evidence that you get to see. Finally, comment on the limitations and advantages of your evidence map.
For example, in our study, we see that most studies used Cox Proportional Hazards modelling to study the incidence of different types of heart disease in response to exposure to air pollution. Cox Proportional Hazards is a modelling strategy where "time to event" or hazard of events are analysed. These are useful analytical strategy for prospective and retrospective cohort studies and where events (such as hospital admissions or heart disease incidences) are reported \cite{Thomas_2014}. We also see majority of the studies came out of Chinese population (Figure \ref{346923}) . A shortcoming of this rapid evidence map is that it is not comprehensive enough to provide a detailed break up of the different kinds of studies on air pollution and heart disease published throughout the world as it relied on only one source and was too restrictive. So while it may be useful for a short demonstration, it is neither comprehensive nor be useful to provide a detailed picture of the nature of evidence on the association between air quality and heart disease. A detailed ROSES map was also not provided. 

Further reading

So, this was a short introduction to how to conduct an evidence map. We recommend you learn more about these in the following pages:
Systematic map at Environmental Evidence Site: https://environmentalevidencejournal.biomedcentral.com/submission-guidelines/preparing-your-manuscript/systematic-map provides detailed instructions on how to create evidence maps for publications
James and Haddaway (2016) provide a detailed methodology of writing a systematic map \cite{James_2016}
GEMS or the Global Evidence Mapping Initiative provides more detailed examples \cite{Bragge2011}

List of papers used for our study:

Bai, Li, Saeha Shin, Richard T. Burnett, Jeffrey C. Kwong, Perry Hystad, Aaron van Donkelaar, Mark S. Goldberg, Eric Lavigne, Ray Copes, and Randall V. Martin. “Exposure to Ambient Air Pollution and the Incidence of Congestive Heart Failure and Acute Myocardial Infarction: A Population-Based Study of 5.1 Million Canadian Adults Living in Ontario.” Environment International 132 (2019): 105004.
Bassig, Bryan A., H. Dean Hosgood, Xiao-Ou Shu, Roel Vermeulen, Bingshu E. Chen, Hormuzd A. Katki, Wei Jie Seow, Wei Hu, Lützen Portengen, and Bu-Tian Ji. “Ischaemic Heart Disease and Stroke Mortality by Specific Coal Type among Non-Smoking Women with Substantial Indoor Air Pollution Exposure in China.” International Journal of Epidemiology 49, no. 1 (2020): 56–68.
Cohen, Gali, David M. Steinberg, Lital Keinan-Boker, Yuval, Ilan Levy, Shimon Chen, Rakefet Shafran-Nathan, Noam Levin, Tal Shimony, and Guy Witberg. “Preexisting Coronary Heart Disease and Susceptibility to Long-Term Effects of Traffic-Related Air Pollution: A Matched Cohort Analysis.” European Journal of Preventive Cardiology, 2020, 2047487320921987.
Ho, Andrew Fu Wah, Huili Zheng, Arul Earnest, Kang Hao Cheong, Pin Pin Pek, Jeon Young Seok, Nan Liu, Yu Heng Kwan, Jack Wei Chieh Tan, and Ting Hway Wong. “Time-Stratified Case Crossover Study of the Association of Outdoor Ambient Air Pollution With the Risk of Acute Myocardial Infarction in the Context of Seasonal Exposure to the Southeast Asian Haze Problem.” Journal of the American Heart Association 8, no. 6 (2019): e011272.
Konduracka, Ewa, \Lukasz Niewiara, Bartosz Guzik, Maksymilian Kotynia, Piotr Szolc, Grzegorz Gajos, Jadwiga Nessler, Piotr Podolec, and Krzysztof Żmudka. “Effect of Short-Term Fluctuations in Outdoor Air Pollution on the Number of Hospital Admissions Due to Acute Myocardial Infarction among Inhabitants of Krakow, Poland.” Polish Archives of Internal Medicine 129, no. 2 (2019): 88–96.
Liu, Guangcong, Baijun Sun, Lianzheng Yu, Jianping Chen, Bing Han, Bo Liu, and Jie Chen. “Short-Term Exposure to Ambient Air Pollution and Daily Atherosclerotic Heart Disease Mortality in a Cool Climate.” Environmental Science and Pollution Research 26, no. 23 (2019): 23603–23614.
Ljungman, Petter LS, Niklas Andersson, Leo Stockfelt, Eva M. Andersson, Johan Nilsson Sommar, Kristina Eneroth, Lars Gidhagen, Christer Johansson, Anton Lager, and Karin Leander. “Long-Term Exposure to Particulate Air Pollution, Black Carbon, and Their Source Components in Relation to Ischemic Heart Disease and Stroke.” Environmental Health Perspectives 127, no. 10 (2019): 107012.
Lunny, Carole, Sue E. Brennan, Steve McDonald, and Joanne E. McKenzie. “Toward a Comprehensive Evidence Map of Overview of Systematic Review Methods: Paper 1—Purpose, Eligibility, Search and Data Extraction.” Systematic Reviews 6 (November 21, 2017). https://doi.org/10.1186/s13643-017-0617-1.
Wang, Xuyan, Yong Yu, Chuanhua Yu, Fang Shi, and Yunquan Zhang. “Associations between Acute Exposure to Ambient Air Pollution and Length of Stay for Inpatients with Ischemic Heart Disease: A Multi-City Analysis in Central China.” Environmental Science and Pollution Research, 2020, 1–12.
Warburton, Darren ER, Shannon SD Bredin, Erin M. Shellington, Christie Cole, Amanda de Faye, Jennifer Harris, David D. Kim, and Alan Abelsohn. “A Systematic Review of the Short-Term Health Effects of Air Pollution in Persons Living with Coronary Heart Disease.” Journal of Clinical Medicine 8, no. 2 (2019): 274.
Zheng, Murui, Yanhong Zhang, Wenru Feng, Yuliang Chen, Lin Huan, Shu Ye, Jiagang Wu, Jun Huang, Yifu Liao, and Pi Guo. “Short-Term Exposure to Ambient Air Pollution and Acute Myocardial Infarction Attack Risk.” Journal of Public Health 28, no. 4 (2020): 367–374.