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In page Robert A. Heinlein:

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Beginning in 1970, Heinlein had a series of health crises, broken by strenuous periods of activity in his hobby of stonemasonry: in a private correspondence, he referred to that as his "usual and favorite occupation between books".[1] The decade began with a life-threatening attack of peritonitis, recovery from which required more than two years, and treatment of which required multiple transfusions of Heinlein's rare blood type, A2 negative.[citation needed] As soon as he was well enough to write again, he began work on Time Enough for Love (1973), which introduced many of the themes found in his later fiction.