function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['H. Jabbari & Gh. Niknam & A. Fallahi & E. Zahedi Asl & M. Nikdel', 3],
    ['Holovachov, Oleksandr', 6],
    ['Jabbari, Habibeh & Niknam, Gholamreza', 1],
    ['Nguyen, Thi Anh Duong & Peña-Santiago, Reyes', 1],
    ['Vu, Tam T. & Ciobanu, M. & Abolafia, J. & Peña-Santiago, R.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);