All Pharmaceutical company have strategy. They target the doctor just after getting their graduation. I can remember, in early 2012, while was doing my internship with other friends, we were invited in various events where there were general gift packs, restaurants where buffet were arranged with delicious food item, fantasy park to enjoy different rides etc. Personal gift was also different from company to company starting from pens engraving company name to more costly gift. 

Those gift also varies according to the position of the doctor. Those who have more option to right medicine , those were given more valuable gift. Shockingly, some of our senior were so sold to those company that they used cut prescribed drug from juniors prescription and replaced it with his/her favorite company's drugs. Professors levels doctors were offered to visit outside country where company used to bear all the expenses.