function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmad, Wasim & Naz, Tabbasam', 5],
    ['Kumar, Sumit & Ahmad, Wasim', 11],
    ['Naz, Tabbasam & Ahmad, Wasim', 10],
    ['Nguyen, Duong Thi Anh & Vu, Tam Thi Thanh & Bonkowski, Michael', 2],
    ['Shahina, F. & Nasira, K. & Firoza, K. & Erum, Y. I.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=29)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);