This paper is in the following e-collection/theme issue:

Email & Web-Based Communication 

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Works citing "Physician Response Time When Communicating With Patients Over the Internet"

Per Egil Kummervold, Jan-Are K Johnsen
J Med Internet Res 2011 (Nov 01); 13(4):e79 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.1583):

(note that this is only a small subset of citations)

1. Cheung CS, Tong EL, Cheung NT, Chan WM, Wang HH, Kwan MW, Fan CK, Liu KQ, Wong MC. Factors Associated With Adoption of the Electronic Health Record System Among Primary Care Physicians. JMIR Medical Informatics 2013;1(1):e1 [CrossRef]
2. Ahmed OH, Sullivan SJ, Schneiders AG, Anderson L, Paton C, McCrory PR. Ethical Considerations in Using Facebook for Health Care Support: A Case Study Using Concussion Management. PM&R 2013;5(4):328 [CrossRef]
3. LaVela SL, Schectman G, Gering J, Locatelli SM, Gawron A, Weaver FM. Understanding health care communication preferences of veteran primary care users. Patient Education and Counseling 2012;88(3):420 [CrossRef]