Deciding to specialize in obstetrics , he served his National Service as a lieutenant in the Royal Army Medical Corps in Singapore , where he did much of his specialist training under Benjamin Henry Sheares at the British Military Hospital , Singapore .
VERB PART VERB ADP NOUN , PRON VERB PRON PROPN PROPN ADP DET NOUN ADP DET PROPN PROPN PROPN PROPN ADP PROPN , ADV PRON VERB ADJ ADP PRON ADJ NOUN ADP PROPN PROPN PROPN ADP DET PROPN PROPN PROPN , PROPN .