It's difficult to know the precise cause and different types of nut butters may also give rise to different results. (inspirededibles.ca)
Dr Ackland said the process could take months and even then the precise cause might never be found. (theage.com.au)
It remains to be seen what the precise cause of Fellaini's visit to the hotel where PSG's players are staying was, with the former Everton man surely not set for a transfer to the Parc des Princes. (caughtoffside.com)