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Recently, the work “Urban-rural differences in factors associated with willingness to receive eldercare among the elderly: a cross-sectional survey in China” was published in BMJ Open, it discussed the influencing factors of the eldercare model, and I had the pleasure to enjoy it. But I have a question that in the ninth paragraph in introduction section: “Many other recent studies have examined differences in willingness to receive eldercare between urban and rural areas.” But, there is not a reference, indicating the “many”? Biomedical research waste [2,3] is heatedly discussed recently, and “Towards evidence based research”  was published in BMJ and it pointed out that all new research should be based on existing evidence. So, should there be a relevant reference?
1. Xing YN, Pei RJ, Qu J, et al. Urban-rural differences in factors associated with willingness to receive eldercare among the elderly: a cross-sectional survey in China[J]. BMJ Open 2018;8:e020225.
2. Chalmers I, Glasziou P. Avoidable waste in the production and reporting of research evidence[J]. Lancet, 2009, 374(9692):86-89.
3. Moher D, Glasziou P, Chalmers I, et al. Increasing value and reducing waste in biomedical research: who's listening?[J]. Lancet, 2015, 387(10027):1573-1586.
4. Lund H, Brunnhuber K, Juhl C, et al. Towards evidence based research[J]. Bmj, 2016, 355(1):i5440.