"Having had recent cause to be ..."

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Having had recent cause to be admitted to Grantham hospital, Iam prompted to take this oppotunity of expressing my appreciation and sincere gratitude to all the members of the hospital team for the efficient, caring and overall helpful service of treatment afforded me at the time and on subsequent occasions as an outpatient. In addition to this transportation to and from the hospital was arranged for me most efficiently and administered in the same caring and efficient way. I wish to also thank the chief execuive of Grantham hospital for his letter of acknowledgment to my original letter.