http://ieeexplore.ieee.org/document/7289167/

yes

Yes. See the Hossein Fotouhi's paper.

Yes you can use rpl for any smart object build through IOT

Dear Sankar Sennan,

see these Papers about the RPL Applications in Smart Healthcare:

 M.  Al Ameen,  J. Liu and  K. Kwak: Security and Privacy Issues in Wireless Sensor Networks for Healthcare Applications, Journal of Medical Systems, Vol. 36, Feb. 2012; DOI 10.1007/s10916-010-9449-4

https://link.springer.com/content/pdf/10.1007%2Fs10916-010-9449-4.pdf

 P. Kumar and H.-J. Lee: „Security Issues in Healthcare Applications Using Wireless Medical Sensor Networks: A Survey“, Sensors(Basel),  Vol. 12(1), 2012

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279202/

 C. Abreu and P. Mendes: Wireless Sensor Networks for Biomedical Applications, IEEE 3rd Portuguese Meeting in Bioengineering (ENBENG), Feb. 2013; DOI: 10.1109/ENBENG.2013.6518413

http://ieeexplore.ieee.org/document/6518413/

 C. Abreu and P. Mendes: „Deployment of Wireless Sensor Networks for Biomedical Applications; Quality of Service Improvement through Network Lifetime-Extending“, IEEE 15th International Conference on e-Health Networking, Applications and Services (Healthcom 2013), Oct. 2013; DOI: 10.1109/HealthCom.2013.6720665

http://ieeexplore.ieee.org/document/6720665/

 C. Abreu, M. Ricardo and P. M. Mendes: Energy-aware routing for biomedical wireless sensor networks, Journal of Network and Computer Applications, Vol. 40, Apr. 2014; https://doi.org/10.1016/j.jnca.2013.09.015

http://www.sciencedirect.com/science/article/pii/S108480451300204X

 F. Gara, L. Ben Saad, R. Ben Ayed and B. Tourancheau: RPL Protocol adapted for Healthcare and Medical Applications, International Wireless Communications and Mobile Computing Conference (IWCMC), 28 Aug. 2015

http://ieeexplore.ieee.org/xpls/icp.jsp?arnumber=7289167

I wish you all the best

https://link.springer.com/content/pdf/10.1007%2Fs10916-010-9449-4.pdf

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279202/

http://ieeexplore.ieee.org/document/6518413/

http://ieeexplore.ieee.org/document/6720665/

http://www.sciencedirect.com/science/article/pii/S108480451300204X

http://ieeexplore.ieee.org/xpls/icp.jsp?arnumber=7289167

Thanks Sir

Yes, if you have a network that has a higher level of delay than usual.