A systematic literature review of attribute based encryption in health services. - Imam, Raza; Kumar, Kaushal; Raza, Syed Mehran; Sadaf, Rumi; Anwer, Faisal; Fatima, Noor; Nadeem, Mohammad; Abbas, Mohamed; Rahman, Obaidur (J. King Saud Univ. Comput. Inf. Sci., 2022)