func SetTimeout(d time.Duration) {
	client.Timeout = d
}
SetTimeout sets the HTTP client timeout duration. The default timeout is 10 seconds.
package ncbi
import (
	"encoding/xml"
	"io"
	"net/http"
	"net/url"
	"strings"
	"sync"
	"time"
)
var client = http.Client{Timeout: 10 * time.Second}