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Zuiderent-Jerak T, Strating M, Nieboer A, Bal R.Zuiderent-Jerak T, et al. Among authors: bal r.Soc Sci Med. 2009 Dec;69(12):1713-21. doi: 10.1016/j.socscimed.2009.09.049. Epub 2009 Oct 14.Soc Sci Med. 2009.PMID: 19833425
Lemmens KM, Rutten-Van Mölken MP, Cramm JM, Huijsman R, Bal RA, Nieboer AP.Lemmens KM, et al. Among authors: bal ra.BMC Health Serv Res. 2011 Jan 10;11:6. doi: 10.1186/1472-6963-11-6.BMC Health Serv Res. 2011.PMID: 21219620Free PMC article.
Walters BH, Adams SA, Nieboer AP, Bal R.Walters BH, et al. Among authors: bal r.BMC Health Serv Res. 2012 May 11;12:114. doi: 10.1186/1472-6963-12-114.BMC Health Serv Res. 2012.PMID: 22578251Free PMC article.
Stoopendaal A, Bal R.Stoopendaal A, et al. Among authors: bal r.Soc Sci Med. 2013 Feb;78:78-85. doi: 10.1016/j.socscimed.2012.11.037. Epub 2012 Dec 10.Soc Sci Med. 2013.PMID: 23265806
Cramm JM, Strating MM, Bal R, Nieboer AP.Cramm JM, et al. Among authors: bal r.Soc Sci Med. 2013 Apr;83:119-24. doi: 10.1016/j.socscimed.2013.01.017. Epub 2013 Jan 26.Soc Sci Med. 2013.PMID: 23415046Free article.