[R] Estimating Mean of a Poisson Distribution Based on Interval censoring

[mohsen hs]

Dear all,
I appreciate that if you let me know if there is any package implemented in R for Estimating Mean of a Poisson Distribution Based on Interval censoring? And if yes, could you please provide some information about it:) 
By the way, is there anything for lognormal?I think fitdistcens is not good for this purpose as it gives me different result compared to SAS and only useful for right/left censoring and not interval censoring (or both left and right together). 
Kind regards,Mohsen
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