function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gadallah, Neveen S.', 7],
    ['Jahantigh, Fatemeh & Rakhshani, Ehsan & Mokhtari, Azizollah', 1],
    ['Madl, Michael & C, Bembecinus & F, Bembix & C, Brachystegus', 2],
    ['Mokrousov, M. V. & Proshchalykin, M. Yu. & Aliyev, Kh. A.', 3],
    ['Mokrousov, M. V. & Shorenko, K. I. & Shlyakhtenok, A. S.', 1],
    ['Rezaei, Sh. & Fallahzadeh, M. & Dousti, A. F. & Saghaei, N.', 1],
    ['Zhao, Liyuan & Li, Qiang & Ma, Li', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);